I scare the kids and parents in the school carpark with my deceleration snap, crackle, pop. Only happens in first gear decel though. However, I can get snap, crackle, pop in 2nd to 3rd, and 3rd to 4th gear changes. As Kato said, I suspect it's excess fuel being burnt off. Strange though given the AFR's on my dyno print out seem to be far from "rich".

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[I]trolololol[/I]