Chip and pulley help

[easygeezer 0]

Hi recently fitted new chip and pulley from G-werks and now have the following problem:

 

Have noticed since changing chip and pulley that when I am giving it some, say 6000 rpm in third then back off the accelerator it gives a violent jolt as if you had stabbed pedal, let off then stabbed again before decelerating as it should.

 

Just wondering if anyone else has had any similar probs or has any ideas what it may be?

 

Before anyone says, Darren from G-werks is on the case but I thought it was worth asking you guys too :)

[h100vw 0]

I used to get that sometimes, my chip was based on an SNS. It didn't do it if you came off the throttle slowly....... Usually worst in 5th, coming back into orbit, from a top speed check :mrgreen:

[Neil VR6 0]

Might even be your front engine mount.

[Rustynuts 0]

I was thinking engine mounts myself. If the car is producing more power then it may just have made itself apparent.