Here's an update. I've located the TPS plug. I've traced it back to this really well hidden spot under a bunch of vacuum lines and fuel/air injection parts (makes me wish the TPS isn't broken). I've unplugged it and have noted that the vehicle observes no change in idle performance or speed. It still has a high idle around 1600 cold to 2000 hot.

Another idea I had: take a jumper wire and close the leads to the Throttle Closed pair on the TPS leads. My only difficulty is determining which leads are which. The thought did occur to me, I could take a continuity tester and determine ground position, but if the ground position in the switch is broken, then it'd yield nothing on the continuity tester.

I suppose I could test the Wide Open Throttle position and just eliminate that option.

From experience, how difficult is it to remove and replace the throttle position switch? Are there any strange sockets or tools needed? Deep reaching metric hex sockets? Short head metric hex sockets? Specially angled wrenches?

I appreciate your input,

-Troy

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- - - '77 federal 280e - 222k miles
- - - '85 380se - 129k miles
- - - '07 Chevy truck
- - - '79 Datsun 280zx with '82 turbo motor
- - - Currently looking for a clean 190e with less than 160k miles.