I have audi a4 2.0 2013. Sometimes whenever I start my engine it just doesn't want to start and I need to pump gas pedal for a few times to make it work. And when that happens when I try to drive the car it hardly moves, engine chokes and most times just shuts off. the real big problem is whenever I stop in a hill. If I stop in a hill, it becomes a nightmare to make the car drive again. When I went to Audi service they changed fuel pump, fuel filter, spark plugs, and some sensors I don't remember. That didn't have much effect. Lastly they said that can be because of turbo, but I don't want to spend couple thousands just on an assumption.

What do you advise me to do?