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if the car was driven in the rain the fender splah guards are missing if it was not driven you have old plug wires or on other systems bad spark plug boots that are leaking + to- and the moisture in the air causes this to happen more because the spark is jumping instead of firing the plugs so you just keep cranking the engine but it won't turn over then after it dries out the car will start up but the engine might shake a little or run rough
Not positive but sounds like coil pack. There is a liquid coolant in em and if it gets a crack in it then it over heats easy. So after it gets hot it stops working. Then it cools back down and works right. Just basing this on other cars I have worked on. Some have two wires per coil. When it starts running bad pull one of the wires off and seee if it runs the same or worse. And if it is the coil you should be able to trace down the one that is bad. Just trying to help.
The problem is moisture could be getting in anywhere. I try to diagnose this problem by using a misting spray bottle of water to get things wet under the hood while the car is running. It's safe as long as you don't spray water down the air intake. Just start the van and wet down anything that looks electronic until the van's idle stumbles or quits. A cracked coil pack or bad plug wire is the most common cause of this problem.
Do you get a check engine light? If so, read the codes with a scanner and chase down the clues. Does the PCM match the car and engine? Was the original engine a 3.8L? 5 to 10 minutes is not very long for an engine to cool down appreciably. Hopefully, the PCM codes will indicate whether the missing problem is fuel or ignition related.
CHECK FOR OVER FILLED OIL LEVEL,DAMAGED BALANCER,LIKE DOES IT WOBBLE WHEN RUNNING OR PLUGGED CAT'S, THESE OLDER EEC IV IGNITION WONT NECESSARLY SET A CHECK ENGINE LIGHT WITH A IGNITION MISS. DID YOU WET THE CAR,IF DID MUST REMOVE ALL WATER,NO MOISTURE AT ALL. TRY PULLING OFF ONE WIRE AT A TIME AND SET IT IN A SAFE LOCATION AND RUN IT,SEE IF PROBLEM MOVES OR NOT. IF NOT ON A PARTICULAR WIRE THAT MAY BE YOUR SUSPECT.
does the check engine flash while driving, a quick test, cause I suspect the coil pack, when dark open the hood start the truck and with a water bottle spray the coil pack if you see sparks replace it, change many of those here ....