well guys my car has been running horrible stumbling,hiccuping terrible i replaced opti,spark plug wires,o2sensors, still ran horrible. i took my car to this guy who really knows lt1's he checked my opti and when bill and i installed it their was a spring not in right the opti was filled with oil,he cleaned up new opti andsealed it better than new,he also found 1 bad plug,and the new wire set i put on he said was terrible so i took them back and got my msd 8.5 man the car is running awesome the power is all back!!!!!!! i love this car ok time to get my throttle body ported from nomad? is that his name? and some bf goodrich drag radials. thank you iam so so so so happy, i love this car...for anyone who has this problem and all the responses are to check opti and look for bad wire lister to it you could only see my bad wire at night with the car way up on lift i would never have seen it arcing with the car on jacks