2003 subaru legacy 2.5L engine misfire at cruse after climbing a long grade all

I have a subaru legacy stationwagon 2.5 GT. I used to have stall outs allot. When I had some friends pull the (fuel sending unite) under the back seat. The 5x5 flat screen unite on the bottom of the "unite" was clogged with rust particles/flakes/chips? don't ask me how rust got into the tank? . Its starting to stall out again, its a year later now. It could be the fuel filter this time? don't forget...if you pull the fuel sending unite use gasket material when sealing the unite back in. If you don't you'll have gas vapors comming into the car, must use the sealent!

Sounds likely to be the fuel filter which is located under the hood on the left hand side close to the brake master cylinder. It is of the cartridge type, so if it has not been serviced lately, throw it away and get a new one.