HI,

Have you the correct plugs, heat range fitted, and haS the co% been set
for and checked on idle and cruise fuelling, you say you have checked fuel pressure, should be approx 3.bar at idle, and 3.5, bar vacuum, pipe off.,
have you done a fuel delivery check to check pump and lines and filter,
check with chip company for co% figures for set up. plus you say injectors
have been tested for flow, we had new and one was faulty untill flushed through
for, about 5min's. and your boost is well below max limit of 3bar setup with 803's,
so cant be that. are you using super unleaded.

DAVE R.