Why is truck still backfiring and hard to start?

1993 MITSUBISHI MIGHTY MAX
200 MILES
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CATHY PECK
  • MEMBER
  • 5 POSTS
Truck started running rough and backfired. Found bad spark plug wires. Replaced plug wires, spark plugs, cap and rotor. Now it still has backfire.
Apr 22, 2012 at 12:24 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Check engine compression for a burnt valve.
Apr 22, 2012 at 12:35 PM
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