I have a 1992 chevy 1500 pickup. The symptoms are that it seems to go in and out of "safe mode" or "limp home mode" at irregular intervals. The truck runs fine but very suddenly will act like its not getting enough fire to the plugs and an odor of running veyr rich with a loss of power. It run run like this for several miles and then suddenly begin running correctly again.
It will do this off and on untill it gradually gets to the point where it stays in "limp home" type mode.
The cat has been replaced, the coil has been replaced and the wires with no effect. A buddy says that also when in this "mode" it appears that half the throttle body is not getting fuel to it????
We replaced the OBD1 computer and the truck ran fine for over 1500 miles and then started acting as before. Replaced that OBD1 computer with another one and it again ran fine for 400 miles and now is intermitely acting up again as before.
Any thoughts would be appreciated.