GTI260IS limited power loss

[max ammo]

Need Help. GTI260 has gradually lost top end from 70MPH to 50MPH and almost stalls when turning right, then gradually builds back up to 50mph. No power out of the hole. Replaced spark plugs, fresh fuel and had the supercharger inspected and OK. Dealer is at a loss... Any ideas?

 

[skiasylum]

Possibly your iTC system. Three components, TAS on handlebar, throttle actuator on the throttle body, and the ECM.

 

[max ammo]

Possibly your iTC system. Three components, TAS on handlebar, throttle actuator on the throttle body, and the ECM.

Looks like I'm at Doo's mercy, beyond my diagnostic skills. Thanks for the thoughts.