I have a 1995 c1500 Silverado 5.7L ~140k miles. Plugs and wires and distributor cap only 4 months old, new fuel pump, replaced ICM, & new ignition coil.

Truck starts up easily when cooled off. I drive it for 20 or so minutes and it dies. I’m in South Louisiana, so its hot, and seems to be most affected when running the truck around noon. First happened a week ago. Truck just dies, but battery and power still on and good - just stops running. Wait ten or fifteen with the hood up and it starts again. Noticed a coolant leak after first time it happened, it was leaking around the heater line running from the water pump. So leaking directly onto the top of the water pump where it connects with the plastic clip grommet thing. It’s a slow leak and has plenty of fluid. Truck never gets over ~180 degrees when it dies, so it is never actually over heating or anything.

Any suggestions on what to try next would be greatly appreciated. I’m reading about coolant temperature sensor maybe being the culprit or also the crank position sensor. I’m also reading the crank position sensor needs diagnostic equipment to replace. It’s not just plug and play. Thanks for any advice

 

When you replaced the electronic parts for the ignition, was there a small packet of heat sink paste with the board, and did you use it?

 

The problem predates the ICM replacement. I used thermal paste from Best Buy which should be even better than what was supplied with the part. I had to buy thermal paste because what came with the part was lost. Problem persisted after replacing the ICM.

 

You may have the same problem I had. Check out my thread titled "Scratchin" my head..."
Plugged plugged fuel return line.
Gene J