My 1998 Pontiac sunfire is misfiring...using only 2 cylinders at times.

  • Thread starter Thread starter Jessika
  • Start date Start date
J

Jessika

Changed the sparkplugs, wires, coil...? ...cat and the muffler. It runs fine without the exhaust pipe connected. Is it possible that the exhaust is clogged? I just cant seem to think of any other reasons....Help Please
Is doesnt have a distributor cap....its an ignition coil... I just dont understand why it would run fine without the exhaust attached....and not any other time.
 
is the check engine light on? do you have a bad O2 sensor?
 
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