This is a repeat of a suggestion made by another poster, either on your previous post or on another persons.:
You need to monitor the DC signal lines using a voltmeter or ideally a storage scope. Look at the 5 volt reference and the 8 volt reference signals. Use the minimopar resource page to help identify the locations and color of the wires.
http://minimopar.knizefamily.net/ecu/lm-1986-t1.html
I would guess that you have a voltage line shorting to ground which is dragging the voltage near zero. It is an intermittant short that is affected by heat or vibration. You could also have a fusible link that is barely and intermittantly making connection to the wiring harness, resulting in an open connection.
Expect to get bombarded with a lot of suggestions but check each one out logically and don't jump to conclusions.
Even if someone had the exact same symptoms, it does not mean that their solution will be your solution. You need to find out what is killing the fuel control and then try to figure out where the problem is.
Since the MAP sensor has a BIG influence on fuel delivery (i.e. mixture) I would start by monitoring the reference signal line to it. You could even unplug it to see if the vehicle will start and continue to run.
There is some possibility, based on your description, that the problem may be occuring as you transition from open loop to closed loop. The closed loop (fully warmed up) condition is very much dependent on a number of sensors.
You need to monitor the DC signal lines using a voltmeter or ideally a storage scope. Look at the 5 volt reference and the 8 volt reference signals. Use the minimopar resource page to help identify the locations and color of the wires.
http://minimopar.knizefamily.net/ecu/lm-1986-t1.html
I would guess that you have a voltage line shorting to ground which is dragging the voltage near zero. It is an intermittant short that is affected by heat or vibration. You could also have a fusible link that is barely and intermittantly making connection to the wiring harness, resulting in an open connection.
Expect to get bombarded with a lot of suggestions but check each one out logically and don't jump to conclusions.
Even if someone had the exact same symptoms, it does not mean that their solution will be your solution. You need to find out what is killing the fuel control and then try to figure out where the problem is.
Since the MAP sensor has a BIG influence on fuel delivery (i.e. mixture) I would start by monitoring the reference signal line to it. You could even unplug it to see if the vehicle will start and continue to run.
There is some possibility, based on your description, that the problem may be occuring as you transition from open loop to closed loop. The closed loop (fully warmed up) condition is very much dependent on a number of sensors.