My truck will be running fine and then will start to power surge (like someone is pressing/releasing the gas pedal) and then the vehicle will die while driving (this has happened at various speeds - but always during driving). When we try to restart the vehicle, it generally will turn over for about 10-20 seconds and then die, but this last time it started up a couple times, died, and then just cranked with no turnover. We replace the fuel filter and it seems to run fine for about two months and then happens again. The fuel filter has been replaced 3 times in the past six months. Any suggestions?