1999 Honda CRV Won't stay running

The truck has been running fine until yesterday when it started runnung at a low idle then had to keep pushing on the gas to keep it running then would stall., finally it would just die after a few seconds everytime started. Changed the fuel filter and ran fine for one outing then back to the same problem. I'm thinking it might be the fuel pump but i'm no expert. Last year in the winter it would have problems starting sometimes but once started it would run fine. Wasn't sure if this mattered. Thank-you