When the problem is ongoing, if it cranks good, have a helper crank it while you check for spark at the plugs, if everything is hot, wear gloves. Check proper fuel pressure and fuel injector pulse.
I'm especially interested in the fuel injector pulse. If your losing rpm signal, there will be no fuel injector pulse.
How long since overall tune-up? Any applicable trouble codes? Your obd1 so checking trouble codes should be easy, as long as your mil lamp works. There may not be any codes, I don't know? I can only help with testing, you have to do the testing.
SOURCE: Same thing here...
thanks for your help I will continue checking this since I have like 2 month with this problem, I will let you know what happends probabliy I will need to take my truck to a dealer,
Regards.
SOURCE: Stalling
Possibly faulty ignition module is the problem, stalls when engine is hot when you sit for a while it cools off and runs again until it heats up again, those are usually the symptoms of a bad ignition module and after a while it may give out all together and not run at all, usually if the module is at fault it shuts down the fuel pump so the engine don't load up with fuel, do to when engine continuously cranks over the injectors never stop squirting fuel and flood the engine do to lack of spark which is produced by the module, this could possibly be your problem.
SOURCE: 1991 GMC sierra stalls
bad coolant temp sensor,or idle air control valve, and possilbly just low fuel pres.
SOURCE: 1991 GMC TBI 350 sierra stalls bad
Could be the TPI Sensor or it might be a touch out of timing.
SOURCE: 1998 GMC Sierra- runs rough then stalls when
had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!
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