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99 gmc sierra 4. 3 stalls and loses spark
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Question
woodrow_333
Ok my truck is a 99 gmc sierra 4. 3 auto ac. I bought this truck a week ago and i cant figure out this problem. It runs fine then it just stalls and loses spark. I staryed by changing the coil and icm. That didn't work so i changed the crank sensor and distributor. That still didn't work so i changed the pcm. Still same thing. Usually the thing stalls and starts back up but sometimes it stalls and wont start. I took it to an auto electric place today and they charged me 300 bucks and told me it was the fuel pump. They claim it had spark the whole time they were messing with it and that the fuel pressure was lower then sixty. I called bull shi# and drove the truck home. Let it run in the driveway and it stalled again and no spark again. I just put 1000 bucks into this truck and painted it and the only good auto electric guys in town screwed me. I just dont know what to do now. I am a skilled mechanic and i cant figure this out. Any help would greatly be appreciated.
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