Ok a while back a bunch of the wires under my car caught on fire. Well my knock sensor wire got burned and now im not sure where the other end is. Is it a blue wire? Also is there anyway i can put a resistor on the wire if i can find out? I'm thinking this is why my car hasent been running as good.

 

Blue wire. Click item #1. You are correct that your car will not run as well with the sensor disconnected. The computer will hold back timing to protect the engine while the sensor is out of commisison.