i got a 1994 park ave with the supercarge in it. i keep getting a qdm 4 code and 300 misfire code can someone help please im thinking the computer in it but dont want to spend $200.00 dollars if not the problem thank you Edited by: monster

I don't know the old (pre-1996) OBD codes too well, but my guess is you need new ignition wires. They seem to be a high maintenance item on these cars.