This is a newly rebuilt engine. I'm using and edelbrock pro-flo intake manifold and style LS1 throttle body, TPS and MAP sensors, small cap distributor with remote coil, 32lb/hr injectors, bigger cam and brodix IK180 heads. So far I have found that my TPS sensor voltage is only 0.89 volts at the TPS and at the pin out for TPS at the ECM. That wire should be 5.0V. I really do no understand why straight out of the ECM is only 0.89V. I have tried two ECMs and both gave the exact same voltage. Can someone tell me where the power comes from before it gets to the TPS pin out? I think there is probably a short somewhere. Will a broken knock sensor prevent engine from running? the plastic piece the clip goes onto in the center is broken and loose just basically floating in the center. There is a black two pin plug with green rubber seal at the drivers side front of the engine. The wire emerges from the fuel injector harness. I need to know what that originally went to.