HI,

do u have a boost gauge in the car if so make sure car is not over boosting,
u say u changed phase sensor,do a wiggle test (make sure all connectors) are
well on and clean at all sensors map etc, maybe map sensor or throttle switch if
u get it at the same revs under load, TDC sensor if u have a multimeter at pin 4+3-
u should have between 600/1000, ohms.

Dave,