I have this what i can only describe as a misfire. The car when driving normally... 2-3k revs seems to jump like i have kangaroo pwtrol!!!

When i accelerate hard i sometimes get a bang and a puff of smoke (raw fuel?) from the exhaust. This does not always happen and sometimes the car is fine (not often i must admit)

these aside almost everytime i get high on boost 15-20 psi the car seems to be missing and holding back. Please help, i have had the plugs out and they look ok.

the car is running 21psi max on dark greens with a 330 bayjoo chip.