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

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.

by in Huntington, WV on February 21, 2014
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1 answer
ANSWER by , February 21, 2014
Does it smell like rotten eggs.