So I have searched and searched to no avail... Hopefully someone can guide me in the right direction. I bought this 94 GC 4.0L with a bad fuel pump and a promise of good condition once running... Turns out after installing new fuel pump the thing dies randomly. It does not feel like it is starving for fuel, more like it looses spark. It just dies. After it warms up it will idle very low - like around 300 rpm or less. I have replaced the battery, IAC, Plugs and Wires, and cleaned the throttle body. I suspect this issue is electrical, but I really don't know where else to look... I am pretty broke right now so I really need to be able to test something before just replacing it and hoping that it will fix the issue. I can't ever seem to make the car stall when I want it to.. Only when I'm 10min away from home and have to get a buddy to help me get it back home. Any help is appreciated!

 

It could be the crank sensor or the cam sensor (aka the pick up coil). You need to see if you have spark when the engine stalls, if there is no spark it is most likely one of those two sensors. But, I have seen a few PCMs cause a stalling issue once they get warm. Check for spark.