engine probs

[shaan]

hi there iv just replaced my head gasket cos it went also put on a new head,replaced cam belt, and got it tuned. since ive done about 200 miles in it, and when ever i get to about 80-90mph the car starts juddering any ideas cos its a real bummer doing 70

[SKoob]

what size engine u got?

[mikeoxford]

overfuelling?

on my weber 32 34 once, the choke stuck open and when i got to 65 70 it juddered and felt like it was gonna die