Hello Everyone, I purchased a 2004 Colorado 2wd I5 Crew Cab (76,000 miles) in November after I totaled my 2003 Tiburon GT 6-speed (AEM CAI, Custom Catback, Headers, Dry Vex Nitrous kit...) and have been reading the boards everyday and I finally decided to make some upgrades. After 1 month of...

Ok so for the last month or so I've been trying to remedy a P0171 (System too Lean Bank 1) code that keeps coming on. I have an 05 3.5L Colly with a K&N FIPK2 57 Series intake. I am also getting a P0455 (EVAP Emissions System Leak (Large))every once in a while but much less often than the P0171...