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It is indeed a faint click that you may not readily hear on the car. The simplest way to test whether a TPS is malfunctioing and that the switch is being seen by the ECU is to use Diagnostic Test Mode 2 (DTM 2) on port 2 of the OBD connector. See the FAQ here on how to do that. The fourth bullet point is the test for the TPS.
Being that you heard it click when the throttle body was removed, but not on the car, do be sure that adjustment of the throttle cable and the linkage rod turnbuckle between the spindle and throttle are not preventing the throttle from fully returning to the closed position.
As for your driveabilty issue of stalling coming away from idle, check the adjustment as well as the operation of the TPS and as well be suspicous of a sticky/worn/dirty IAC valve. If the throttle plate stop screw has been played with in an attempt to change idle, it can create all kinds of such problems. Less likely to be your problem, but still important to check, be sure that all air induction and PCV hoses are fully seated, there are no splits and the clamps are snug, Especially check the underside of the main air intake tube for splits in the accordion section. When coming away from idle, the engine will twist on its mounts and could open up a split there.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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