Idle speed controller...

Im having problems getting my supra to start again, it just quit out all of a sudden. The engine still turns over when I try to start it but Im getting no ignition. Theres fuel, air, spark and compression so Im wondering why its not firing. I figured it must be a sensor somewhere, and Ive heard about the ISC going out and being a big problem.

it could be the cam sensor, the wire broke on mine and it got no compression.