Hi my 2003 seat leon 1.820v t has developed a flat spot/ surge at higher revs/ higher gears, more noticeable over 50mph it's like your outing your foot on and of the throttle constantly. Had a stage I remap a few months ago and fitted a milltec cat back system all fine, then fitted a forge recuirulator valve and it was just after that I noticed it doing it. Decided today to put the old original valve back on and still doing it but don't seem as bad but defiantly still there, just wondering if anyone's come across this before. Thank you