Had really bad rpm surges, stalling out, stabilitrak, traction control, engine limp mode, the whole lot. I replaced the throttle body/tps sensor. Still having the same problems. Replaced pedal position sensor, still having same issues. Replaced both PCV valves (the metal breather one and the black plastic one with clips) still having the same issues. Replaced spark plugs and battery as well. I don’t know what to do the rpms are surging like crazy but only when driving. Has a normal idle and won’t stall when not driving but once you put it in drive and start to move the rpms surge and the whole car shudders, and the engine goes into reduced power mode and it stalls. Does anyone have any ideas??