sounds like its surging ? interesting try turning the boost down for a test or have u tried that
Only running 7psi until i get this prob sorted cant go any lower! lol
Originally Posted by
haz87
Silly question but have you had your plugs out to check Karlos?
Originally Posted by
haz87
to add: I know you've fitted new ones but have you had them out to see if any cylinder stands out etc
Yup had them out when I fitted the NMS head last week, problem was there with old head too.