Van starts then check engine comes on sometimes.it also will sta

Check electrical connects at the battery , power cable to the main fuse box under the hood in the engine bay. Voltage drop testing starting an charging system circuits . Find electrical distribution diagrams here http://www.bbbind.com/free-tsb Enter vehicle info, year , make , model an engine size . Under system click on electrical distribution ,then under subsystem click on power distribution . Click the search button then the blue links one at a time . Check main power feeds . Check for resistance in power feed cables .
Starter Voltage Drop
Voltage Drop Testing the Charging System
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Electric Testing Techniques You Need to Know

It could be a throttle position sensor is the check is light on? There is also a crank position sensor that has to be re learned sometimes with engine swaps as well

my van is doing the same exact thing but the othe day it was perfectly fine no slipping i went about 25 miles and i started off from a stop the engine rev and tranny slipped and the van died i restarted the van it runs great but acts as if there is no transmisson does not take power frm ngine when shfted does nothing please help

remove dog house locate test port and install guage should be 45-60 psi

COULD YOU HAVE PINCHED FUEL LINE UNDER TRUNK, ABOVE FUEL TANK?

What year and model is the van? If it's a 97-2001 caravan, then there were issues with the clusters cloking up, usually from an electrostatic discharge. Generally they would still run, just could'nt use the gauges. There is a printed circuit board on the back of the cluster that is succeptable to electric spikes. The most common cause is a spike induced from the secondary ignition cables into the main engine wiring harness. Look at the ignition wires on the rear of the engine, they may be routed too close to the harness under the upper intake plenum. The data bus wires run between all of the modules on the van and any electrical spike can cause this. There was also issues with spikes from the door lock actuators/latches. If they're buzzing when you hit the power locks this may be your problem.

Check the connections on the battery,It sounds like one or both may be loose.

think this a problem for dealer mechanic with product knowledge,because all lights coming on then loss of power sounds like it could be an ECU fault being triggered by a sensor,or just a component in the ECU breaking down .It would need the computer connecting then running till fault shows up .sorry i couldnt give an instant fix

usually ignition coil will cause you this grief obd 2 scan your engine light to confirm nature of your misfire

possibly replacing the MAP sensor