Sounds like all the basics are checking out good. Idle Air Bypass and Idle Speed Control are the same thing. If the car died when you disconnected it, it's working fine.
What do you mean by the TPS signal is constant? It should change, smoothly, as you move the throttle (voltage to the tps is constant, the signal changes with throttle). I haven't 'adjusted' my tps, but I think it's done by modifying the holes in the tps to allow you to rotate the sensor to adjust it's voltage at idle. i could be wrong.
Maybe you can post the codes your getting now. Not sure where to go next....
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