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What causes my mountaineer to idle rough?
1999 Mercury Mountaineer

What causes my mountaineer to idle rough?

(1999 Mercury Mountaineer)
My mountaineer will not idle in cold weather and once warm it is still rough. There is not a check engine light on. I just had the transmission replaced last year. Once the cold weather has appeared the idle has started to get worse. This vehicle has high miles. What can the causes be??
1 answer & 1 comment
Popular Answer
on November 30, 2011
bad upper intake gaskets. very common failure. have them checked by a shop by doing a smoke test in the morning before it is started.

Roy
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on November 30, 2011
Thanks so much!
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on November 30, 2011
bad upper intake gaskets. very common failure. have them checked by a shop by doing a smoke test in the morning before it is started.

Roy
Sign in to reply
on November 30, 2011
Thanks so much!

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