Ok heres the problem and I am about to smash the damn thing with a hammer. I need to go get my Emission test done again and the damn knock sensor takes a crap 2 days before I am about to go. So I buy a new one from Gm and I put it in. I get the car warmed up and take it out for a drive. The car runs ok but something is wrong. So I plug my Scanner in and watch the timing table and knock count. If the car is at idle and I give the throttle a quick hit, the car will back fire every now and then. I then noticed that the car gets a knock count every time I do this and it drops the timing down to around 16 to 17 degrees and then it climbs back up. If I slowly give it gas the timing is normal ranging from 36 to 40 degrees. When the car is in open loop, It runs like a raped ape. But when it goes into closed loop, it seems to loose power. Everything on the motor is new, I mean everything!!! All gm sensors and new plugs and wires. The car was running ok before but I did have the closed loop/open loop power difference before the knock sensor going out. I know this is a case of false knock but I cant find out where its coming from. I tried racing fuel in it but it didnt help the knock scenario. Can I just tune the knock retard out?? The car does have a Dyno tune on it done by Speed Inc. Any ideas would be greatly appreciated as I need to get this damn Thing running right soon so I can pass emissions. THanks