Bsktkraze

First off, I'm new to this site, so hello, and I really hope I can get some insight from someone. We have been having problems with our subaru for a while now. It's been to 3 garages, and still no luck. Timing belt, oil change, lots of stuff was done to it at the beginning of this year, was just inspected and it came through fine. The problem comes when my husband drives up large hills...........on an incline, the engine seems to hesitate and then the check engine light comes on. He is no mechanic, not handy one bit, me, well, when I have to be I can be, but I come from a family of plumbers, not mechanics. Any ideas. My dad thought maybe the fuel pump? I'm preparing myself now for the bill that will probably bankrupt me at the dealership, so just give me the bad news straight up.