Hello everyone I am Brand new to this site. I joined in hopes I would be able to gather some info or help regarding the current issue I am Having with my truck. I have a 2011 silverado 5.3L with some basic bolt on mods including cai, tbs, headers, and hypertech chip. Approx 4 weeks aGo my wife calls me and tells me my check engine light came on with a pinging noise. After digging on what she did that day, she had put regular fuel in the tank when the hypertech chip was set to premium. I took the chip out that day returning the truck to stock which subsided the pinging noise. But then noticed check engine light still on with rough cold starts lasting 5 sec then running normal. I took the truck to a guy who specializes in custom tuning, which he advised me the codes popping up were p0172 and p0175 which is both banks running rich. After doing a live scan with efi live, both banks are running -21%. Also I noticed the K&N tube was loose on the throttle body. I went through and checked for loose vaccum lines ad tightened down the intake tube, did a fuel cleaning treatment, and carefully cleaned the maf. Truck still has the rough cold start and is running rich.. Anyone have suggestions ? If worst comes to worst I'll take off all mods and take vehicle in under warranty.. Jus trying to avoid the Hassel dealing with Chevy warranty cause the truck is lifted. Thanks in advance!