Fuel pump regulator
 

So I took my 2006 audi A3 in to get checked out because there feels like there is very little acceleration. I slam on the gas and it takes a long time for the transmission to switch gears. The shop told me no codes came back for the transmission, which im thankful for. I wanted to know if anyone had experienced this as well. Also what the process my be to fix this, just a range would be fine, and maybe any other help.
Thank you