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Check engine light on?
The high idle usually means you're getting a pretty good-sized air leak downstream of the throttle plate, although there can be other causes.
OK, the first two guesses are based on the "whatever you touched last caused the problem" rule:
First guess would be a vacuum line downstream of the throttle (on the throttle body) has been knocked loose. The fact that it's dying after being put into reverse should help narrow down which line, but I'm drawing a blank right now. There's not that many...check 'em all (both ends). Might even be able to hear the hissing on this big of a leak.
Second guess would be the IAC got gunked up when the TB was being cleaned...you'll get similar behavior when the IAC is stuck open. Should be able to id this easy -- with the car warmed up, stick your thumb over the IAC hole upstream of the throttle plate. Should pretty much kill the engine. If it does, it's likely the IAC needs a good flushing out (if it doesn't, see first guess).
A distant third would be the coolant temp sensor is reading too "cold", and your mixture is being set too rich. Should be able to check this (with the engine warm) by disconnecting the green connector up at the engine coolant outlet (where your upper radiator hose connects to the engine). If you're suddenly able to start and the engine idles OK, then it's the sensor (fail-safe on that sensor is "engine warmed up").
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Linear Mode
