We have a 1992 gmc jimmy 4.3L without vortec, when you first try to crank it, it will miss jump and you have to push the gas pedal down to keep it running. After a while once it warms up it clears up and drives fine. We have replaced the plugs, wires, dist. cap and rotor button, the MAF, and the oxygen sensor. Dont know where else to check any help is appreciated, Thanks.
Oct 17, 2009 at 1:48 PM