Mechanics

WHY IS TRUCK STILL BACKFIRING AND HARD TO START?

1993 Mitsubishi Mighty Max • 200 miles

Truck started running rough and backfired. Found bad spark plug wires. Replaced plug wires, spark plugs, cap and rotor. Now it still has backfire.
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Cathy peck
April 22, 2012.



Check engine compression for a burnt valve.