the car was fuel injected the over the head visor has the factory label telling you not to pump the gas pedal because the car is fuel injected but there is a mechanical pump nowI would also make sure there is a good ground path from batt to engine, engine to body, batt to body, engine to frame. There are also grounds at the underside of the dash where it bolts to the hinge pillar. Many of these get removed when previous owners "improve" things.
I'm thinking it was the 4.3 originally as well but I'm not sure guy I got it from gave me no real info except where the motor came from and what transmission is in itSorry, I was thinking SS car. I guess it was a 4.3 originally?
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