My 383 does the samething. runs great in OL and I can always tell when it goes to CL cause the idle quality goes to crap. I know for sure its CL causing this because in EEhack if i force open loop and override aft to around 14.1-14.3 it runs great. Kur4o has a patch for $EE that allows OL idle. it works by going into OL whenever it sees BLM cell 16 (idle, 0% tps). you may give it a try. he posted it in the "two major $EE questions" thread.