I have a 1996 GMC Sierra 5.0, I have replaced Plugs (correct gap), replaced wires, replaced rotor cap, replaced dist. cap, replaced idle aire valve and replaced map sensor....going out of my mind... idle rpms about 1100, seems to idle ok, but as soon as I put in gear she starts to shake like a dropped cyl. rps to about 600-700 I have taken out plugs (3-4 times) seems to have good arc, removed and replaced caps (dist and rotor) checked all vac lines and still the same problem..
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check engine light is solid at idle and flashes at higher rpms
I have added injector cleaner into gas tank, I have looked down throttle body and there seems to be a lot of carbon or crud build-up...is there anything i has spray down there to clean it out or does the upper manifold have to be removed?
time for a trip to the dealer.
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