basically when the car hits 4000 revs, when driving, its revvs really quickly and jumps to 7000rpm, but feels as if the car is not gaining speed, usually around 80mph. The the revvs jump all the way between 5 to 6 then to 7000 Revs! but the car didnt gain any speed! i then slowed right down, then took it back upto 80 and onto 90, without that problem, however, later on, it started happening again. Basically, when driving, the car revvs feels weird after about 3k, and onto 4000rpm and after that, like the car is in neutral and my foot is on the accelarator. The gears arent popping which i thought it was at first. hope you understand what i mean!