I'm having what sounds like an injector not firing...sounds like a bad exhaust leak (tic-tic-tic) (not valve clatter) and I had to drive the car today..after I got home I check the engine and could hear what was sounding like smooth metal to metal...dryish (hard to make the sound). Could this be the rings dry from the cylinder not firing? Potential permanant damage from this? Worth taking the upper intake off and trying to fix the inject0r/harness or clogg or whatever it is. Anybody ever have a cylinder not firing? I ran the computer scanner and everything checks out OK.