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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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