Hi All, new to PF, Ive been posting on RSOC since Feb, but hoping someone on here may have had this issue and fixed it...
1990 Esc RS Turbo standard
Just had a rolling road set up and now it hunts and surges up to 3000rpm/40mph and no power like too much lag, then from 3500rpm it goes like never before! Any suggestions or ideas as to what it could be.

Cheers
Andy