Instead of replacing components, test each component until you identify the source of your trouble.
The ignition system isn't the only thing that could cause a misfire. You could also have a lean misfire, or even a fouled plug.
One of your injectors could be bad, and not spraying enough fuel to ignite. Also, one of your injectors could be leaking and sending too much fuel into that cylinder, fouling that plug and preventing it from firing. Finally, you could have excessive oil leaking past the valve guides and fouling that plug.
Tuesday, February 23rd, 2010 AT 4:57 PM