2004 Ford Mustang Q&A

2004 Ford Mustang Question: exhaust manifold gasket.

does a bad exhaust manifold gasket cause poor gas mileage? -
Answer 1
Yes, because the fresh air hits the Oxygen Sensors and makes the car run REALLY RICH, which cuts about 40% off your mileage. You may also have a Check Engine Light on as well. This article explains about the Check Engine Light http://repairpal.com/check-engine-light -
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When I turn the car on it iddles above 1 rpm ifor about 2. Minutes and then it goes to normal is that normal or is something wrong