Plenum replalced almost two years ago by neighbor. Took it on long drive afterwards and it had a very small misfire when driving it I could feel it. I let the car sit for almost two years and just recently had my mechanic
look at it. He had to replace brake lines and fuel lines and fuel filter. He is not the person who did the plenum repair. btw, because of previous history with an olds I knew about the white smoke and dexcool and shut car off the first time I saw it and there did not appear to be much damage other than the plenum so the neighbor said.
said the engine sounded fine and he took it for a ride. I picked it up two weeks ago and am having terrible gas mileage and smelling pure gasoline when I start the car and back into it. Engine lgt. is on. Sometimes blinking. Drives good. slight misfire when in D,R but not in P OR N. My mechanic is on vacation. I am a female. Ok, lol, what could be the problem. Thanks guys, so much.