Mechanics

BMW 330CI BACKFIRE PROBLEM

2003 BMW 330ci • 73,000 miles

I have an exhaust backfire and the engine roads rough I mean lack of pull no fault codes have changed the o2 sensors ccv spark plugs cat tested. What should I do?
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Guest
November 28, 2012.



Are the coils new?

Dr. Hagerty
Dec 3, 2012.