Lean bank 1 and idles rough sometimes if I turn ac on it idles a bit better, thought it was MAF replaced that, also replaced Purge Valve because I got a random p0443 one time during this issue and I have gotten random misfires p0300 code but the main one I get is the p0171, thought it might be the intake gasket so we changed that too, fuel trims are at ST 26 and long term 31 but go down to zero when at highway speeds, also tried to look for vacuum leaks but might be missing something, any other ideas would be greatly appreciated thanks for any help you can offer on advance Richard….oh mileage is 146615 but the engine is a new remanufactured engine with 2400 miles on it