2003 GTS Spyder 3.0L Bought the car Feb.. end of March engine light came on, got it checked P0302 (cyl 2 misfire) well i wasnt aware you had to use premium for it.. so i started using "the right gas" and drove to tn and i gave it hell pretty much on the interstate, light went off. well about 2 weeks ago it came back on with the same thing.. since march its had a complete tune up and valve cover gaskets were changed. i ran injector cleaner through it.. still there. theres been 3 different people that work on these cars for a living and they cannot feel it mis or hear it . had it reset and it still comes on.. getting pretty mad ha any help/ideas??
thanks