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3.4L misfiring on cylinder 3 and 4

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Old 06-19-2013, 07:11 PM   #1
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3.4L misfiring on cylinder 3 and 4

During accelerating fairly hard to go around a stalled vehicle, my 2003 started missing/running rough. Scanner showed P300, P303 and P304. What would make 3 and 4 start misfiring all of a sudden like that? Thanks for your help.
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Old 06-19-2013, 07:29 PM   #2
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I had the same exact problem one day.

Im not entirely sure what caused it either. Its like the 2 cylinders decided to cough and die.

I seafoamed hte engine afterwards, and changed the EGR valve, and it hasnt happened again...
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Old 06-19-2013, 07:45 PM   #3
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Check your spark plugs and spark plug wires, make sure they are not broken or nipped. I had this problem with my Camry.
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Old 06-20-2013, 08:30 AM   #4
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Check your ignition coil. Same issue I had and that fixed it
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