We had a used body control module put into our minivan last year. Within the last 6 weeks I noticed it hesitating when slowing down from going 55 to 25. The RPMs will occassionally jump when slowing down. When the cruise control is on it is sluggish going up hills. Just this past Monday it stalled in the driveway. Restarted right away. No engine light goes on. My husband tested the battery while running and it doesn't appear to be the alternator. It has 171,000 miles on it. Seems to shift okay. Engine sounds good when running.

According to this there isn't one

https://fuse-box.info/dodge/dodge-caravan-2001-2007-fuses

And this confirms there isn't one. The are controlled by the Body Control Module.

https://www.chryslerminivan.net/threads/both-headlights-went-out-on-my-dodge-caravan-2005.82722/

No headlight relays or fuses on your model year. It is all controlled by microprocessors in the Body Control Module (BCM) and Front Control Module (FCM). You can try resetting them by removing the IOD memory fuse in the fuse box or the negative battery cable for 5 minutes. Have you tried cycling the headlight switch many times? Still out? There is an extended lifetime warranty on 2005/6 Dodge/Chrysler minivan headlight switches:
http://www.aboutautomobile.com/Investigation/2005/Dodge/Caravan/Headlight+Switch

It also mentions above there was a recall on the headlight switch

https://www.google.com/search?safe=off&rlz=1C1QJDB_enCA643CA644&sxsrf=ALeKk03EyFMxR9dby9JKQqr3KZhyDQ3SrA%3A1612641772078&ei=7PUeYPahBIWk_QbM57ngBw&q=2004+dodge+caravan+headlight+fuse+location

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This is a BCM - body control module controlled wiper / washer system . The wiper switch is a input to the BCM . The BCM then controls two relay's - wiper control (PCB) relay an wiper speed (PCB) relay . PCB - printed circuit relay , that means they are soldered right to the circuit board inside the under hood fuse box . Your problem could be any number of thing's , wiring , control module , relay etc... Hooking up a scan tool an checking for DTC'S - diagnostic trouble code's stored in the BCM would be the first thing I would do , if these vehicle came to me. If no code's ,looking at wiring diagrams would be my next step. Using a DVOM - digital volt ohmmeter to test the circuit's . Do you know anything about any of this i posted here ?
Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year , make , model an engine size . Under system click on body & accessories ,then under subsystem click on wipers / washers . Click the search button then the blue link . Your best bet mite be to take your vehicle to a qualified repair shop.

Try stating the year, brand and model of van you have and re-post your query and someone might then be able to assist you.

I am going to assume the check engine light is not on.
I would check the throttle body to see if it needs to be cleaned, and check the idle air control valve to see if it is working. The computer controls idle speed by the amount of air coming into the throttle body.
The ac problem is probably something different such as low freon or a cooling fan problem.

The wipers are controlled through the BCM (body control module) you must have that scanned to see what is going on with the system. You will need the dealer on this diagnosis.

Your vehicle has electronic throttle control . Position sensor's in the gas pedal an the throttle body , inputs to the Throttle Actuator Control Module
The TAC module is the control center for the throttle actuator control system. The TAC system is self-diagnosing and provides diagnostic information to the PCM through a dedicated serial data line. The TAC achieves throttle positioning by providing a pulse width modulated voltage to the TAC as directed by the PCM.

The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position sensing
• Throttle positioning to meet driver and engine demands
• Throttle position sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system components include the following:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The throttle actuator control module
• The powertrain control module (PCM)
Accelerator Pedal Position (APP) Sensor
The accelerator pedal assembly contains 2 individual APP sensors within the assembly. The accelerator pedal position (APP) sensors 1 and 2 potentiometer type sensors each with 3 circuits:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit
The APP sensors are used to determine the pedal angle. The control module provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors then provide the control module with signal voltage proportional to pedal movement. APP sensor 1 signal voltage is low at the rest position and increases as the accelerator pedal is applied. APP sensor 2 signal voltage is high at the rest position and decreases as the accelerator is applied.
Throttle Body Assembly
The throttle body assembly consists of the throttle body, the throttle position (TP) sensors, and the throttle actuator motor. The throttle body functions similar to a similar to a conventional throttle body with the following exceptions:
• An electric motor opens and closes the throttle valve.
• The throttle blade is spring loaded in both directions and the default position is slightly open.
• There are 2 individual TP sensors within the throttle body assembly.
The TP sensors 1 and 2 are potentiometer type sensors each with 3 circuits:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit
The TP sensors are used to determine the throttle plate angle. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit. The TP sensors then provide the control module with signal voltage proportional to throttle plate movement. Both TP sensor signal voltages are low at closed throttle and increase as the throttle opens.

Flickering light's could be caused by a bad diode in the alternator . Fluctuating idle could be caused same alternator problem or dirty throttle plate.
Throttle Body Cleaning To Restore Idle Quality

you did not id what year/make/model but it sounds a lot like a typical failure of the MAP

however, depending on your year/make/model the code could also be a sign of an power concern to your PCM, (powertrain control module) aka computer

car out of cruise control flutters or runs rough from 45 mph to 55 mph and once over 55 mph runs smooth. I notice from 45 to 55 the rpm guage moves with flutter or rough running engine. when i put in cruise control it smooths out.

chrysler van transmission usally only last 70,000 miles you were lucky the problem is the radiator is to small to cool the transmission fluid properly have trans rebuilt put after market trans cooler on & you should not have any more problems

Check the timing, if it is way off the belt has jumped and the cam is out of time, also are there any burn marks on the insulators of the spark plug wires that go down into the head?? that is a common problem, If the car is a hig miler then replace the wires with a high quality set, don't use cheapo wire sets.One other thing make sure the rubber intake hose is properly connect to the MAF sensor and intake throttle body and has no cracks or leaks