Most Halal Mod
Join Date: Feb 2008
Location: 7900' in Colorado
The 'shim' isn't a shim. You have to use a procedure using feeler gauges in order to find the sweet spot for the Closed Throttle position switch.
Short and sweet way to do it without the feeler gauge is this:
Warm it up, all the way up. At least 15 minutes of running, minimum.
Loosen, but not all the way, the 2 phillips screws holding the TPS to the side of the throttle body. With the engine running (obviously running high because the TPS is out of adjustment), MICROSCOPICLY turn the TPS counterclockwise just until the rpm drops back to normal. Do this with the TPS still connected, just like normal.
Now, tighten the screws. If it changes after you tighten them, then loosen and adjust just a hair further, then retighten.
If the idle goes up again, turn the TPS just a hair again. Good to go.
Now, if you don't want to do that, then get yourself a feeler gauge, some wire, an ohm meter, a wiring diagram, the copy of the actual procedure and an hour of your time. Might want to learn some new cuss words while you're doing it, makes things interesting.