Between ~2-4% accelerator pedal position, throttle position varies about 1-6%. Car idles fine. No codes. Frustrating problem. Thread discussion at e90post here: http://www.e90post.com/forums/showthread.php?t=1270000 datazap here: Have done the following: Replaced injectors. Replaced spark plugs Coils less than 25K old. Nearly new vacuum hoses. Replaced Boost solenoids. Replaced cam position sensors. Replaced VANOS solenoids. Replaced VANOS check valves. Walnut blasting done 30K ago. Replaced both TMAP sensors (upgraded CP TMAP twice - to N20 with BMS cable, then back to stock - no change) No apparent boost leaks from logs (but thse important thing to note is that this can be deceiving for a small leak) Replaced throttle body to charge pipe gasket o-ring(more below) Have tried multiple MHD tunes, including flashing back to stock stock. Flashed Alpina transmission mod back to stock. No effect. Car has mods but they are not players. ER CP(no leaks). Problem existed with previous CP. DP's are high flow catted. Problem existed with stock DP's. MHD tuned, but have flashed back to stock stock with no change in behavior. Have reset lamba/fuel/VANOS/Throttle adaptions with MHD multiple times. No effect. Really running out of options. Last three are: 1. WB O2 sensors 2. DME harness 3. DME Anny help appreciated.