Question about 1999 Toyota Tacoma PreRunner

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Running rough got a p0304 when ran diagnostic check. Idles fine. Runs really rough when driving. Check indicated #4 cylinder miss fire and then listed a number of potential problems. Any ideas on how to narrow down?

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Pull the number 4 spark plug and check for wear, cracks and electrical tracking(short to ground). Look for white track marks on the insulator boot going to the spark plug. If it needs plugs, use NGK or Nippon Denso. Let me know what you find and if you need anything else. I will be happy to assist further.

Posted on Sep 05, 2010

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