I have a 94 5.7 z71. I just got it so im trying to get it running good. The previous owner [email protected] alot of stuff needles to say. I replace a fair amount of the ecm conrolled sensors to get the truck run like it should. While under the truck the other day I noticed the knock sensor doesn't even have a wire hooked to it. WTF? There is a blue wire close by but it has no conector on it. Is this possibly the right wire to splice a new pigtail into?? Also im gonna go ahead and replace the sensor itself. I have no cels or any other lights. Truck just doesn't pull like it should and the mpgs are also sucking!! Thanks in advance.