I have multiple problems with my car. I have a huge power loss, my gas mileage is terrible, and a misfire under acceleration. The wires on the O2 sensor seem to have been cut. Could the O2 sensor be causing all of these problems? The car also will not start at random times. I will turn the key and all the accesories come on, but the engine will not turn over; then If a wait a couple minutes to try again the car will start. My car is a 1990 Trans am GTA with the 5.0 TPI engine. Any help would be appreciated.

 

The O2 sensor would cause the low power and poor fuel economy, but not the starting problems. That's most likely a starter or starter circuit problem.