ALFAPAT

Untill I get a diagnostic , diy style I am still looking for clues?

The car loves to trundle under 2500- 2700 revs and pulls well up to there if you go to beyond that and feather the throttle the chatter comes in. If you accelerate right through the peak torque range it behaves normally and pulls reasonably well .
It can smoke if the car is revved at standstill to above 2700 so there is a chance that oil rings are gone but the overall symptons tell me there is something wrong with the cam timing?
The engine will not smoke at normal driving but will so at standstill and high revs, but not always.
I guess its time for component testing if I can get a diagnostic tool also to point me in the right direction, any more clues out there?

PAT