Where the plates seal in the bores can get gunked up bad too, pull the TB and look at the side that connects to the spacer/gasket piece and the dynamic chamber. I bets its all full of gunk, just blast it with carb cleaner and a brush or whatever.

 

Yeah, I would pull the TB

 

Does your car have cruise control? Maybe a malfunction..

 

Thats what I figured it might have been a cruise control malfunction but I dont know anymore. Ill try the carb cleaner and wd40 but its a bitch because the IC.