Okay a family bought the car from a guy and i bought it from them. the wiring in the engine is all messed up. I deliver pizza and i bought the car for gas mileage. but it sucks compared to what the reviews say. I get 29 avg, 27 before i replaced plugs, but my O2 sensor on my exhaust manifold isnt even connected.

The haynes book doesnt have any info on it. Will i be stuck rewiring the whole car?