I'm new at this and also new at having a Acura...

I have a problem I just changed the water pump,Timing Belt, Belts and the motor mount... Now the car wants to stall in D when I stop at a red light and in R all the time. When it does stall I restart it and it runs okay.... I don't know if this was something I did or if its a new problem. We never touched the Timing. Stark plugs are clean. What could it be???? Also It makes that sound like I put bad gas in it. Bare with me I'm a Girl and I'm just starting to learn about cars but I would love any info you guys can give.

Thanks!

Crayola