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2002 Ford Expedition Question: My car will stall out and quit running. codes po401,p1451,p0171 on computer

 

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kb4vay, 5.4L V8, Huntington, WV, February 21, 2014, 17:06
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this problem happens every few days. It almost seems like the gas going to the engine is running a bit lean. The smell from the exhaust smells weird.

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