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97 Plymouth Voyager Intermittent Stalling

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My fathers '97 Grand Voyager 3.3 has been experiencing a fairly intermittent stalling issue, while driving. Happens most frequently when slowing down to stop, and sitting at traffic lights, or sometimes just driving around town. Will not stall on highway, at consistent speed. No ignition codes. Has a radiator cooling fan code, can't imagine that has anything to do with stalling. (It has new IAC, wiring around plug and harness looks great. Van will idle when it's happy.) I should also mention that this van does have a BCM short somewhere, doors will lock themselves, and tail light/side marker light circuit also has an issue. Before I continue, I need to mention that this van is a work/beater van. It is not pretty and does not warrant, "professional", fixes, or premium parts. It just needs to run and drive.

Now, back to the stalling problem. It tends to stall within the first 5-10 minutes of driving for first time of day. If I let it sit for 10 minutes on side of road, it'll fire right back up, and run great for rest of day. Occasionally, it'll quit twice on the same day, then fire up and run great after 10 minutes.

I can't figure if this could be an ignition issue, as if the coil is getting hot, like on a lawn tractor, or of it is a BCM/computer/sensor issue. I thought to myself if maybe the security system immobilizer could be killing ignition, based on the door lock short. Just a thought there.

Again, there are no ignition codes, or any engine related codes either. Engine is not missing or stumbling, during normal driving. One time, when engine fired up after stalling and waiting the 10 minutes, revved engine to limiter, and engine was backfiring, sounding like out of throttle body. Leading me to think ignition issue. Just another thought there as well.

What are you guys thinking?

Thanks!
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I THINK the BCM is behind the passenger side kick panel. If your cowl drains are clogged, the water from the cowl will run inside the fender and down to the connector on the BCM. I'd take a look at the cowl drains, clear them and pull the plug on the BCM and use some CRC Electrical Contact Cleaner on both the pins on the BCM and the connector. Then I'd plug and unplug it a half dozen times in order to help "sweep" the connection clean and retry it. This won't really take that much time and just might help with the door lock and light issues.
 

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Could a faulty torque converter lock-up switch cause this? I'm just trying to think outside the box.
 

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Do you have a vacuum gauge? If so, why don't you use it and see what it tells you? I have one, but haven't had to use it in many years because I try to stay on top of my vehicle maintenance. In the past, it has helped me out. It's an old one. Used to be my Dads and I know it's over 50 years old.
 
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