I Have a Cav Turbo and and discovered a big problem, if i'm driving normally the car is fine, ut if i boot it the turbo will come in and it will get to about 5-6000rpm and i get a massive misfire/backfire kind of thing. then if i drive it after boosting it it will misfire, and if i press the accel it feels like its gonna die then all of a sudden it will run properly again, what could this problem be.
I've had a new head fitted+gasket. Recon Turbo. New Plugs.
This was happening before i had the above done.
The Courtney low comp pistons seem fine and the bottom end dosent knock.