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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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