98 4.3 chevy blazer backfires
replaced coil, wires plugs cap rotor crank senser coil module. checked out voltage + resitance on componace metioned. all are in limits.compretion is good. no vacume leaks. on this model cam senser will not cause a driveability isues. what to check next?
If it backfires when you take your foot off the accelerator pedal you have a bad diverter valve for the A.I.R. (air injection reaction) system. HTH. -Jim