T-BIRD THAN ROUGH IDLE EVERYTHING SEEMS TO WORKING FINE. ENGINE WARNING LIGHT IS ON.

1996 Ford Thunderbird

Tiny

mmiller6672

August, 5, 2011 AT 6:56 PM

My 1996 Thunderbird is running fine and gas mileage remains good, except for the fact that it idles rough at it's normal idle of 700 to 750 rpm than automatically increases 1000 rpm smooths than dips to 500 rpm, rough again and the cycle repeats. Engine Warning light came on when this happened. What is most likely the cause?

FOUND 17085 RELATED QUESTIONS

1 Answer

Tiny

JDL

August, 5, 2011 AT 7:21 PM

How long since a tune-up? Check applicable trouble codes. Some of the national brand autostores used to check codes for free. Maybe you have a vacuum leak?

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