Just cos it was on a rolling road doesn't mean the operator knew his arse
from his elbow.
I've five (count them) 5 engines just like yours,in my basement that
were set up by the various 'experts' around the rather large city I live in.
2 things seem to have cured this,-
1, run the thing on AVGAS and ALDON OCTANE BOOSTER if you can't
get your local airfield to sell you the stuff LARGE TESCO'S now sell
99 (better than Optimax) octane and just put more Aldon in it.
2, you will have to run it on pump fuel occaisionally, so get it set
up by Jamie at Jamsport as he seems to be the only person in the
south (OOOH CONTROVERSIAL) who cares about your car,knows whats for sitting on/leaning on a bar and does a cracking job.