I am a 15 year old and rebuilt a 390 with a 2-barrel in a 1975 ford f150. I have put on about 500 miles on the motor after the rebuild (mainly around town and to my friends house 5 miles out of town.) here is my problem: the other day i almost ran it out of gas. It was very low but not completely dry. It was sputtering really bad, when i went to turn into my driveway it then ran fine. When i shut it off and restarted it and it started and ran fine. I put in 2 gallons of fresh gas from a gas can to get it to the gas station. When i went to drive it to the gas station it was still sputtering, but not as bad as before. After filling I drove it about 3 miles and it was still missing (although about the last 1/4 mile it was getting alot better.) It is still sputtering. Do you think i sucked up some gunk from the tank into the carberator? Should I change the Fuel filter? The filter is a inline see through one. If it got clogged would that cause it to sputter but lessen eventually? The filter is fairly old but still seemed to work good. the fuel pump is only 3 years old. this missing is driving me crazy! if anyone could help it would be greatly appreciated!!!