thanks for all advice. ive got 2 new sets of plugs ngk's and a set from ford motocraft but they are stamped denso. dont know what would be the best set 2 put in and not sure of the gap ive heard it should be 1 or .7 if car has been tuned.
i also noticed the boost had been turned all the way up so turned it down. i think this definetly helped it a little but still not sorted problem.