My wife's '05 Libby has recently developed a sticking accelerator. No toyota issues, checked that first

It's not even the gas pedal or cable, but in the throttle body somewhere. It feels as if there is sand inside the throttle shaft causing it to stick, sometimes at high rpm.
Anyone ever have this issue? I'm thinking I may have carbon buildup under the butterfly plate causing it to hang up. I currently have a carb return spring on it until I can figure it out.
_________________
'99 Tahoe, 3" BL, 285/75/16's , MT II's.
'05 Liberty Sport, -wifey's
'98 Poncho Fireturd, 3.8L, .....the purple pig!

