i have been having this problem. at cruiseing speed it will misfire and sputter but if i put my foot into the gas this problem will go away until i am back at part throttle. i have gone through 3 different types of plugs.....stock, ngk tr6's, and now stock SRT-4 plugs. all have had this problem but i have noticed that once this situation starts if i am going down the road and i leave the car in gear with the clutch out and turn the car off and then back on at a roll this problem goes away until i turn the car off? WTF???
i'm thinking that it could be my map sensor or my TPS going out but i'm not sure. I have heard of some people with the 03 ecotec having this problem due to bad injectors and o2 sensors but i am clueless so i'm asking the ORG for help.




2.2 L Ecotec, P&P Head, Stage 3 Comp Cams, Supertech 76 lb Spring kit, Supertech Oversized Valves, Wiseco 8.9:1 CR Pistons, Eagle H-Beam Rods, Home-Built Turbo Kit T3/T4 57 Trim Intercooled, 78 lb/hr Racetronix Hi-Z injectors, Aeromotive FPR, Racetronix f body fuel pump,MEGASQUIRT MS3 + MS3X Finally street tuned on 21 lbs! Now if only I could get it to hook....