Can someone shed some light for me on this issue. I've gone through 3 TPS sensors slotted and no matter how I set it it surges around. It was fine on original TPS sensor until I gave it to a friend to use while the car was down. Setup is an E85 rec port 408, TH400 RMVB, with ls3 intake and 92mm throttle body. I'm sure i've just overlooked something out of frustration. Ignore the wideband it needs recalibrated.