Since I have this car one problem is never solved. So all advices is welcome, because this is my only problem but it is very annoying.

When I flor it, boost start rising, car accelerate, but then suddenly car start to breaking, I mean engine doesnt accelerate good anymore, and I hear that engine change noise a little, just like you go uphill and flor it but revs are too low.

This problem I noticed in second and 3th gear.

I set ignition timing , fueling (about 12.3 : 1), new sparks, new spark cables.

what you advice me to see? maybe cam? what are simptoms of worn cam?