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Occasionally when accelerating pretty hard, I've noticed a "surging" kind of feel to the car.....kind of ...... non-linear acceleration.
Hard to describe really. Doesn't do it all the time though, only now and again.
Car is a 2004 MY05 Sti PPP
could well be surge - nearly all of them have it (to some extent) though it is harder to hear on unmodded cars due to the airbox. I was told this by Bob Rawle who seems to know a thing or to.