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I have a 2003 1500 with a 4.8. Month ago I got codes p0120 p0220 p1516. Truck didn’t go in reduced power mode. I cleared the codes and they never came back. Issue is on my code reader it say my throttle position at idle and warm is 10-16%. Truck runs perfect except a little rough shift in 2nd. Would this be a tps problem?
168158
168159
 

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Throttle has to be open a small amount for engine to idle and that's just about right. There is no IAC if the vehicle has DBW.
 

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Cleaned the maf and tb today and the percentage dropped to 2.7% at idle. I had to rev it up to 1500 rpms to get to 11%. Looks like cleaning it did some help.
 
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