Ok I have the mileage master and both in put and out put lights are on at the same time is that good or bad and why because the truck runs I just changes the distributer the rotor and the plugs but the mileage master says in put and out put at the same time.
Mileage master? Im a bit confused what you mean? 94 was a split year for chevy. Is this the rounded front body style, or the earlier box style? They have different instrument panels. A bit more info, and I should beable to help you.