Update... my mechanic made a good point.. we haven't touched the engine and before this happened we never had the rev issue. So unless the battery being hooked up backwards caused a sensor to fry, he is thinking it is the ECU. The engine light stays on when the car is running and the light on the ECU stays solid... doesn't blink a code just stays solid. Does this mean the ECU is bad?
Thanks again for all the input!