Chrysler Repair: 97 3.0L stumbles on warm restart, coolant temp, crossover pipe

Question
I have a 97 Voyager 3.0 that has a stumble only after a warm restart of the engine. When you drop the van into gear and try to accelerate it stumbles and backfires through the intake to the point that it will stall if you don't floor it, then it's fine. No engine light or codes involved and once you get moving it's fine the rest of the trip.

Answer
Hi John,
Because the only temp sensitive sensor is the coolant temp sensor, that would be one item to check for accuracy. When the engine is still hot (near normal operating temp) it should read around 1,000 ohms across its terminal (as opposed to 7,000-14,000 when cold). If that were "off value you could get a too rich mixture. You will find it adjacent to the thermostat housing at the top front of the engine.
The other possibility is that your egr valve is sticking open when it needs to be closed in order to accelerate (and even to start the engine). That valve is on the rear side of the engine (the firewall side) and is fed by a small pipe from the exhaust crossover pipe below it. It is mounted horizontally and between the round top and the valve body proper you will find a flange inside of which is the valve stem. The stem has a slot into which the tip of a screwdriver can be inserted so as to be able to lever the stem back and forth, against spring-action which tries to close the valve. The spring should be able to close the valve firmly. If its action seems sticky then spray some WD-40 on the stem where it enters the body and work the stem back and forth to lossen it up.
Those are my ideas for your problem. Please let me know what you learn or if you have questions via the "thank/rate" tab.
Roland