Same exact prob as Ftc!... When the car warms up it starts to stumble at light throttle. The check engine light would flicker but no codes are showing up on the powerlogger/scanmaster. Only thing that I pinpointed at this point is that the crank sensor appears to have rubbed against the balance ring judging by obvious markings along the ring. Not sure if this is related but I'm waiting for a new crank shaft sensor before moving on.