O.K. so I went to the dealer to get the sensor replaced and of course the problem didn't show up, so the mechanic showed me what to look for if the knock sensor was bad. On the back left side of the S/C there is a vacum hose connected to a "bladder" that has an arm on it...when the engine is idleing the arm is halfway open and when full throttle is applied the arm is completely vertical....if the knock sensor sees a problem the arm will be all the way down therefore shutting down the S/C. And of course that didn't happen while I had it there they told me when it happens either bring the truck to them if I can or call them asap and they will change out the sensor.Also they told me that the o2 sensor could be at fault and also if I do change the t-stat to the 170 degree that I have that could also help the "detonation issue" that I'm having.....STAY TUNED THIS IS GETTIN GOOD FOLKS!!!!