C5 Throttle Body P1516 P1221

[Over140mph]

Friend's '03 Z06 is possessed!

Randomly and intermittently, the car goes into limp mode and these codes are thrown.

We cleaned the throttle blade area, lubricated it and it will still go into limp mode once every 20 miles or so.

It seems that the drive-by-wire actuation works fine when the car is parked and the gas pedal is swept from idle to full throttle and anywhere in between and the % of the sweep is always correctly shown on the scanner.

Doesn't look like there's any ability to buy the stepper motor or whatever is in the housing.. or is there?

Thanks for any pointers..

[roadpilot]

If I had this problem I would spend the 2 or 3 hundred bucks
and buy a TB. Time ,effort, has a price. You are spending it now.
You can buy aftermarket, a stock GM will be expensive.
Good luck