I have a 2001 stratus rt 3.0 i replaced the harmonic balancer last year imediatly it lost a ton of power since there is no sensors by it or even close to it im baffled. since then the plugs, wires, distributor, fuel pump, sparkplug seals, and valve cover gaskets were replaced. the car still ran the same, smooth but no power and 15 mpg. next was the timing belt, water pump just cuz, new cam gears, and the map sensor. the cats are good. now it runs even worse if you hit the gas it chokes, spits and sputters and wants to die and sometimes does. @ around 3000 rpms it runs smooth down the highway unless you step on it. I'm at a total loss and cant afford any more useless fixes. i have $700 in just parts in this. PLEASE HELP!!!

SOURCE: engine problens

Have you had the fuel tank inspected/cleaned? This may have been done whent he fuel pump was being replaced and there was access to your tank interior.

If you have crud in your tank, especially if it's leaves, paper or flakes of old coating/paint, then it can float around and slosh in your tank and at the most inopportune time get sucked over the fuel intake for the pump and choke off or restrict supply. This can give the symptoms you describe, where there are spells of repeated weird symptoms, and then it changes symptoms or appears to dissappear for a while when the crud floats away from the pump. As soon as the fluid motion of the tank brings it back over to the fuel intake, the restriction starts again. Then when you stop the car, and the suction stops and lets it drift off and fall to the bottom of the tank, it seems to be fine again until fuel flow again sucks the offending item back against the intake. I've seen this on three occasions in the past with the same symptoms as you describe and it also foxxed repair shops to no end. On one occasiosn a guy's solution to a rusty tank was to use a tank coating kit. However, if you don't prep the tank and follow the instructions precisely (which he did not) the coating doesn't bond and can pull away from the tank walls and break up into small sheets that can cause the issues I describe above.

Hope this helps

SOURCE: 1997 DODGE RAM 1500 360 VERY LOW IDLE

I think you have ruled out the engine with all the parts you have replace. The transmission torque convertor is in lock up mode all the time. The engine is having to hard of a time to stay at the normal idle. The over drive clutches and soleniod are most likely damaged in the transmission.
I think you should take the vehicle to a trasnmission shop , The can check the torque convetror soleniods and pressure control soleniod.

The oil light coming on bothers me. I know you have the rebuilt engine in the vehicle but I think the oil pump in the engine is starting to go out or could be weak. The lower bearings connected to the crank shaft might be starting to leak. Have the oil pressure checked .

SOURCE: I have 2002 dodge stratus, replaced timing

sounds like plugged catalytic converter for the exhaust... have it ckd out

SOURCE: 2002 Dodge Stratus Rt 3.0L Need Firing Order

For the 2002 Dodge Stratus 3.0L SOHC V6:

Firing Order:
1-2-3-4-5-6

Cylinders:
......(back).......
|...1....3....5...|
|...2....4....6...|
......(front)

Distributor Connections:
..(back)
.....1
3........2
5........6
.....4
.(front)

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SOURCE: LOOSE POWER AFTER ABOUT 15

I am gussing you are not getting an engine light it seems you have ruled out all the usual suspects?