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My phase 1 was also having this problem thought it was also air leak or ICV
turned out to be the shaft on the throttle body worn, when the car is revving high try pushing the black part of the thottlebody where the cable sits,if it moves in towards the butterfly and the revs drop. its probably...
Yeah that's never good when you think bits fall off aha , my wheel nuts came loose on one of the front wheels :o Took awhile to find out what the knocking noise was aha ,