I have a 99 pontiac grand am and it is misfiring on cylinders 2 and 4?

  • Thread starter Thread starter sarah h
  • Start date Start date
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sarah h

i also recently changed all the plugs and wires, so how would i fix it?!!?
 
Chances are the injectors for those cylinders are clogged , you can try using injector cleaner but they sometimes need to be replaced..
 
I had the same problem. I had replaced my fuel injecters and that didn't work. I had to remove half the engine to get to the heads to find that one of the heads was shot because of cyclinder misfiries. Replaced both heads instead of just one to be on the safe side. Didn't even last a month, the cyclinder misfired again, but this time to the point where the misfiried caused the pistonbroke, shot the head, and split the engine. Now is the time to get rid of the car, before you have to spend $5,000 for a new engine like I did.:mad:
 
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