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Have a few questions, wonder if any of you have some ideas or input on them... I have an 2003 Chevrolet Silverado 2500HD 4wd with the 6.0L Vortec (U code for VIN) and has about 179K miles on it. The truck was getting a check engine code of P0101, MAF Sensor, I replaced that one and now I am getting the below codes, on and off... P0131 Oxygen Sensor Circuit Low Voltage (B1S1) P0151 O2 Sensor Circuit Low B2S1 P0327 Knock Sensor DTC Code P0332 Knock Sensor 2 Circuit Low (Bank 2) Everything except P0327 (normally stays on during normal driving) comes up when I floor the gas on the highway. But when going around 65 - 70 mph at 2000rpm, and gives full throttle, the truck down shifts to 3000 rpm first and then once more down to 4000 rpm, but there is no torque... truck actually slows down going uphill instead and does not go above 4000 rpm. Should I bite the bullet and change the knock sensors and O2 sensors as well? I got the suggestion that it could be clogged cats, but it's not idling or running rough... Any ideas?
