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Anyone have any input on this matter? My E99 is doing the same. Cold start it idles fine, once it starts warming up it starts jumping 200-300 rpm (too fast for tach to read). Does it with Tunes installed or without. Cruising is fine until you let out of and its still in lock up it really causes truck to jerk and snatch. Horrible in gear at a red light, I can hardly hold the truck back with brakes.
I have elimated the pcm and idm by using a wire harness to run my truck off of a 2001 models pcm and idm. We did an injector test and all the injector pulses sound the same. Did an injector balance test and each cylinder seemed to kill about the same power.
1. have heard that it could be an injector allowing compression back up into the fuel system (causing air bubbles in return line-airiating fuel in tank?)
2.high pressure fuel pump and/or ipr valve.
3. blockage in fuel passages in head.
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