2002 Ford Focus Focus rough idle and popping sound when acc

2002 FORD FOCUS
126,000 MILES • 4 CYL • FWD • AUTOMATIC
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BMOCBARKER
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My car runs very rough at idle, worse when in gear and when it is cold outside. There is no check engine light on. I have replaced the MAF sensor and had vacuum leaks checked.

There is also a popping sound coming from the engine when under light acceleration and sometimes at idle.

What is the problem? Could it be a stuck valve?
Oct 12, 2009 at 10:32 AM
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