Thanks for the replies. i am currently building a zvh so when thats done i'll get it on the rollers. i originally thought it was cam timing but i put a std cam back in and it was stilll the same, just slower lol. interesting about the actuator though. what syptoms did the car have exactly as mine seems to boost ok holds 9psi. was running 15psi but the hesitation was worse.
also even when the ignition timing is on the factory marks when you floor the throttle from low revs it pinks for about half a second. anyone else have this on their car?? doesn't pink at all on boost even with the timing advanced. oh yeah is 100 miles from 20quid normal? driving normally. plugs look ok not black.