rudyyy

Hello i have b7 2.0 tdi multitronic 2007 . my problem is that the sometimes the rpm stuck on 1500 when i drive slow 50km . when i step on the gas it go no problem, but when i go slow its stuck on 4 gear not going on 5 gear... when i slow down they stay 1500 and in the last moment when i stop the rpm drops down .. when i go they go up again to 1500 .. i change gearbox oil and filter no change .. no computer errors.. it happens 1 a week ..can it be some DPF auto regen mode..