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1999 Ford Escort "Cool" 2dr Coupe ZX2 Cool

1999 Ford Escort
Trim Info:
Front Wheel Drive, 2 Door Coupe, Subcompact
25 mpg city / 33 mpg hwy
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December 6, 2012, 3:22 pm

Vicki W
 

Question: rough idling when heat of air is on

My car has rough idling. It's barely noticeable if I don't have my heat or air conditioner on. However, when either of them are on, the rough idling is very noticeable. I know rough idling in general can be cause by either a bad spark plug wire or misfiring cylinder. But what could it be in this case an what's an estimate on fixing the issue?


December 12, 2012, 8:09 pm

Richard W
Expert Mechanic

You could have a vacuum leak. It's hard to give a price. It could be from $150 to $800.


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