My 1992 GMC Sierra will start but will only run for 20 seconds exactly.
My 1992 GMC Sierra will start but will only run for 20 seconds exactly. Change fuel pump, fuel relay, tested computer. Swapped computers, Replaced Cap and it still runs for only 20 seconds.
Check the distributor module.
My 1994 GMC Is doing the same thing. If I unhook the small wire from the altinator it will run but I still don't know how to fix it.
Check your oil pressure sending unit
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