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could be a leaky injector or maybe a faulty O2 senser (lying to the computer) thats a bout all (I think) Is it blowing alot of black smoke out the exhaust???
 

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The O2 sensor could be it. I had that problem with my 3.1, although the code said "lean exaust", but it had alot of black smoke coming out. The reason being the O2 was messed up and told the computer to make the mixture richer, and it never recognized it done anything. New O2, problem solved, and about 4 more mpg, lol.
 
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