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I would also suspect the ignition module. They tend to work ok for a few minutes when they are cold, then fail once they warm up. If you wait awhile for the ICM to cool down, it will work as well as it can until it warms up again. A code scanner is your best friend to know where to start looking, and to perform tests and log data.
Probably not. If one of the sensors were faulty you should have a check engine light on and a trouble code for the sensor.
Have you checked the plug wires ?
And as a side note, I don't show a 2002 Venture mini-van having a 3.8 engine.
There is a "Cold start routine" that makes changes in the fuel and timing for Cold starts. The vehicle can have 2 sensors with one running the water gauge and the other operating the engine controls.
You probably do not have a working water sensor or the Brain is not making the adjustments. You would need to test the latter, but the water sensor is inexpensive to do trial and error. Just change the correct one.
When was the carburetor last serviced? Have you noticed where choke plate is when trying to start truck when cold, and after warmed up & refuses to start?
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