I4/I5 Engine & Drivetrain
I have a 04 Z71 Colorado 5 cyl, and have a fluctuation of the RPM at about 60 MPH, even with the cruise on.I have replaced the coil packs,plugs,cleaned the Maff sensor with the Maff sensor cleaner, checked /cleaned the air filter, checked for vacuum leaks( Only 2 places?) I have ordered...