87 Chevy K5 Blazer shutting down while driving/issues with turn over
 

need help please. after changing out fuel filter, pump, and strainer as well as ignition coil, still having issues keeping blazer running - it turns over better now (without killing battery) that the ignition coil has been changed but will not run more than a few minutes then shuts down by itself (that was the original problem - while driving, truck shut down like there was no gas in it). need troubleshooting suggestions if anyone has any (the cheaper the better as I am moving this month and funds are tight). the engine is a 350 and only has 25k miles on it (at least that was what we were told when we bought used). thanks in advance.

Carb or throttle body injected? If carb'd, what is the make/model of the carb on it?

throttle body injected

What is your fuel pressure? It needs to be 9-10psi for proper operation.

Note: a special in line adapter will be required to test it. You can get this adapter with most higher cost fuel pressure testers or just buy the fitting and a manual gauge and leave it right on your truck.

Have you tested anything in the ignition system. It is possible that the coil is getting weak or the ICM is failing due to heat, shutting the truck off.

Hi - the fuel pressure was not checked since we did not have a tester; on the ignition system, we only changed the ignition coil, but did not change the module itself (assuming that is another part which I think it is). the coil is what helped it turn over when it didn't before but it did not help it stay running after a few minutes. thoughts?

Have you tried resetting the base timing? How is the compression?

I would definitely suggest you test the fuel pressure.

the timing and compression are fine. I suppose the only other fix is to try the fuel pressure, however, when it did run for a bit, the truck runs great (just like it did prior to the issue). it just dies within a few minutes. just getting frustrated and replacing parts at this time is not really an option (or I should say continued replacement of parts that I am not sure will fix the problem) and this is my daily driver.

When you are having trouble with it, do you get good spark?

the truck runs brand new when it runs then it just dies. it will start up a few times and die out eventually and then after that, it kills the battery when trying to start up again.

But that is not what I asked.

Lets say that the coil is malfunctioning when it gets hot. Or the ESC module. Either could operate normally when cooled down and malfunction to the point of stalling when they get hot.