Hi Guys

I have a Q45 the engine was overhauled and is quite camie the work was done by others, I purchased the vehicle after it had been sitting for 3 years

I have taken it to a dyno guy to tune as it has a mid range engine miss it is fine to about 3000 RPM then develops a miss and gets over it at about 5000 RPM.

The workshop was replaced the spark plugs, knock sensors, fuel pump, coils, and still no improvement on the dyno
the poor dyno guy is pulling his head out

Car any body help

Cheers Garry