mk2 cupra R rpm bouncing around when letting off the throttle, what could be the issue?

[arronleeds]

so my mk2 cupra r has this weird issue where, when i let off the throttle the rpm needle will jump up and down a couple hundred rpm, the car also feels like its bucking at the same time, it can happen if i blip the throttle too but only when accelerating. ive replaced the spark plugs but didn't solve it, what could be the issue, idle rpm is smooth and doesnt happen if i rev when stationary.

 

[Citizenwoody691]

Hi pal. I’ve got the same problem. Car at idle revs itself upto 2000rpm then below 750 and stutters. Just wandering if you got the problem fixed pal?