Solved 89 Chevy 350 To Backfire Constantly 1988 1998 Chevrolet Pickup
Chosen Solution I have changed the spark plugs and spark plug wires and the distributor cap and the fuel filter If it backfires when you let off the gas peddle it has air getting into the exhaust, either an exhaust gasket or cracked manifold before the catalytic converter or the emission control’s Air Injection system. The air injection check valves (STANDARD MOTOR PRODUCTS PT#AV7) are common failure parts. Cost about $18....