1995 GMC Jimmy wont stay running

Hi hbob, Welcome to 2carpros and TY for the donation

Do you hear the fuel pump come on for 2secs when key at run position if so check the fuel pressure if its within specs if okay-test the fuel pump and oil pressure sending unit and report back with some testing results.

NOTE: The FPOPSU powers the fuel pump after the engine starts.

Next time it stalls don't wait for it to cool off-do below immediately to determine if its fuel or spark problem

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing