Today as I went to a friend's house I began to feel the car sort of "floating" on a steady throttle in 5th, as if the forward motion wasn't continuous.
Now on the way back home on a bend to the right cornering hard the car misfired as if it didn't have fuel, and the rest of the way it misfired everytime I tried to pass 4000rpm.
Low down everything's fine then it comes on boost normaly but when it reaches 4k it just stuters (spell?).
When I parked it in the garage I gave it some gas in neutral and it does the same.

Any ideas of what it may be?