O2,s
Hey Chris are your rear O2's still reading? Did your Tuner turn them off? If not the truck under wide open throttle will sence that the truck is rich readings on the rears will make the front ones lean out that is how the truck is designed from the factory. It will also make a poping noise through the mufflers and because the readings are taken from the throttle position sensor and maf you can have a Mess (Can affect the Trans shifting also)I have been through this. The rear O2's need to be off. Does anyone out there have a good street tune he could run I have a portable innavate air fuel meter that can also datalog and read air fuel while making a pass. Mitch
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