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weird rpm fluctuation when letting off, any ideas

Arronleeds

New member
Location
Leeds
2.0 tfsi, when i let off the throttle, i get an rpm fluctuation up and down of of about 100-200rpm. this seems to happen when my exhaust pops, car is a manual and has a decat but without silly pop/bang map. it doesnt seem to happen if i use cruise control. the car also sort of hunts if im driving at low rpm in 1st gear and try to keep a constant rpm. you can feel/hear the hunting, the car idles perfectly fine and no fault codes, any ideas? fuel trims are perfectly fine too.

so far ive changed
n80
pcv
diverter valve
charcoal canister
spark plugs
 
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