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Even easier. With the car off slowly turn that silver sheel on top of the intake manifold that the throttle cables are attached to. When you first begin turning it you should hear a faint click. Then when you let it go back to the resting position, you should hear it click again. That means that the throttle position switch is being engaged.
It's possible that they removed the TPS and didn't reinstall it in quite the correct position when they cleaned the throttle body. (Not that they needed to remove the TPS from the TB to clean it.)
The little bar that goes down in front of the TB, linking the throttle wheel down to the actual throttle is also adjustable, and could be too short to allow the throttle to close all the way, but I doubt they messed with that.
Another thing to check is the black, plastic idle adjustment wheel on the bottom of the TB. This might have been set to a good position for your dirty TB, but now needs to be turned to work well with your clean TB.
I wouldn't focus on the IAC first, I don't think that is your problem.
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Andy in St. Paul. '89 244 147K mi, '91 745 Regina 202K, '87 245 lost to rust at 225K
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