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Originally Posted by LIL_MANDA
 95 Sonoma, 4x, ext cab, auto. GMC IS NO HELP TO ME! Replaced every dang sensor, fixed cat, oil change, air filter, fuel filter, fuel pump, plugs, wires, cap/rotor, alternator, tried injector cleaners...losing my mind here. Truck will idle high or low, or just die when idling, surges when driving, tries to die when driving, really bad when on uphill, loses all power. Doesn't matter on RPM or speed, it does it's own thing. The only time it runs well is after disconnecting the battery...and that's only for 5 minutes. Please help. |
Have you checked fuel pressure? Have you pulled your upper plenum and checked for a leaking CPI/Nutkit (check for washing) (if you have CPI, if not, have you checked the spray pattern on your TBI and made sure the injectors aren't dripping?)
Have you tried pulling and cleaning your EGR and makeing sure the pintle is free and clear.
If the above has been done or you do it and shows fine I would look for a vac leak or clogged cat. But 1st, before you do anything more, get a farking pressure reading on your fuel!