hi everyone just returned from the war.....and now my baby is acting weird.....yesterday she started up ran fine went to grocery store...when i started it it sputtered,ran terribly...then it smoothed out...this morning(it was 22 last night) went to start the car and it turned over and over but wouldnt start at all.......i went back in the house and came out 30 minutes later and it started right up...whats the possible problems? there is gas in the car and i have owned the car 5 years have never replaced the gas filter(i know my bad!) and i hear the fuel pump humm when i turn the key to start....any of you gurus help appreciated