First off its not a gas cap, a gas cap sets a evap fault code, a PO440/442. A lean mixture on one bank of a V type of engine indicates a lean mixture on one bank only. Most likely is a intake vacume leak, if you have access to a scan tool check the fuel trim numbers (long and short term) compare bank one and two should be reading simular. check all vacume hoses for leaks/loose fittings. If the connecters are the same you can switch the front O2 sensers side to side to check and see if the code will switch side to side as well. 02 sensers are failure prone on just about all makes so it may be just the senser. Fouled/dirty injectors with poor spray patterns will also skew fuel trim numbers as well which can set this code althugh it will usally set a fault for both banks. G.M. also has a service bulliton advising not to use after-market K&N type of air filters. Apparently the oil on the filter can cantaminate the mass air flow senser which will also skew fuel trim numbers. The computer looks at the 02 senser voltage and adjusts the mixture untill its happy with the signal (voltage) it sees from the front two 02 sensers. In your case its adding more fuel than is acceptable to make the 02 senser voltage acceptable or the senser is dead and just not responding/producing a voltage.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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