To give everyone an update, I tested the voltage and ground pinouts to the PCM and they are correct. I plugged the connector back into the PCM and the truck fired up and ran smoothly for about 4 minutes before abruptly shutting off like someone turned off the ignition. Immediately trying to crank the truck again will result in the truck not starting. However, if I turn the ignition off and wait a minute or two, the truck will start up and run fine. One thing before shutting off, I did notice is right before it abruptly shuts off it will seem to lose power. However, if I press the gas it will recover and continue running. I pulled the trouble codes off the truck and it is showing a TPS and a coolant sensor failing. I spoke to my father about this, he stated those parts have already supposedly been replaced by the dealership.....Just curious, I want to make sure these are not old codes so how do I clear them without an ODB1 tool? Thanks again for everyone's help and advice.

 

Disconnect the battery for 30 minutes or so, and it will clear codes. You can also disconnect the battery, turn the headlights on for a couple seconds, and that will also clear codes.

Really need to be able to see what the PCM is seeing. (live data.) For that, you need at least a decent scanner. Being OBDI though, those are getting hard to find. Something like a Snap-On MT2500 would be the hot ticket, though last I checked, they were around 400 bucks on EBay.

 

Thanks, I am going to try and locate a OBD1 scanner this week. I thought I had one, but it turned out to be an OBD2 scanner. I disconnected the battery before leaving today and put the battery on a trickle charge. I ordered a new TPS (OEM) and plan to put that in this coming weekend. Just curious, since the battery is disconnected to erase stored codes, any special procedures once I reconnect it? Reasoning being in the past I had an old chevy that was extremely hard to start after leaving the battery disconnected.

 

Yeah, one you have your new parts on there, hook the battery back up, turn the key to 'on', not start, count to 10, THEN start the truck. Don't touch anything other than the key. PCM should figure out idle fairly quickly.

 

Since it runs for a few minutes b4 shutting down, it leads me to believe it might be either the upstream O2 sensor or the intake air temp sensor. To begin with, disconnect the O2 sensor n see if she runs in default mode.

 

Thanks everyone for the help so far. Sorry for the delay in following up but I have not been able to get back down to my father's house due to being on field maneuvers, Anyways, to bring everyone up to date, I replaced the TPS and reset the computer. The truck will now run, until you get up to 50mph and the truck shifts into OD. Once it shifts the truck will shut off or rough extremely rough until it does. My father recently already had the transmission solenoid by the dealership right before they gave up on troubleshooting it. I plan to go down this weekend to work on it, so any advice on what it could be or what to look for would be extremely appreciated.

 

Could be a misfire

 

Had this problem on my last truck. Now my current 2nd gen is doing it. The head gaskets were blown on last truck. Fixed that and then the o/d housing cracked the next week.

Switching od off makes it last another couple weeks then it starts doing it in 3rd gear as well. I'm still not sure what the issue is. Plenum or out of whack driveshaft maybe? This thread talks about it o/d shake. https://dodgeforum.com/forum/2nd-gen...vibration.html

 

I have not checked to see if the will will die if I switch off the OD. I am planning to head down tomorrow to continue troubleshooting and will try that then. Thanks again for information. If there is anything else I can check let me know......Again, thanks

 

Let me know if you figure it out. I'm still driving mine around in 3rd. Check to see if your burning oil. We probably have a plenum issue and need that adapter plate.