Hi there!

I've got some problems after I chipped my A4 1.8T 2002, what happens is that when I get up to 5k rpm it seems that the turbo switches off and stops charging, but it starts again at 5.5k rpm approximately. Could this be a valve or something that fails to keep the turbo pressure and that I should replace it, if necessary which?

Also have a problem when I start the car after I've ran it hot, it just dies out. Sometimes the engine wil lay around 100 rpm and i can't do anything but turn the car off. This came after I chipped the car.

Appreciate all answers that can help me figure out the problems.