I'd be inclined to check the linkage for proper adjustment. Is the idle correct? On the 117's I've run into with ASR, power or control unit failure is normally accompanied with high idle. I've seen damn few of these so odds are I wont be much help.
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.