alright boys its been awhile but I need help fast. My truck has been cutting out bad at idle almost like air in the system but it smooths out and comes back at random this was stock fuel settings. last week I turned up my pump a few flats and it ran awesome but the random missing out was still at idle give it pedal and it goes away. Well today while pulling my trailor and snowmobile it started cutting out while driving BAD, so i floored it and it cleared up but then got increasingly worse.. I held it to the floor for about 8 miles ( i coulda cried being that mean to her ;( ) but it was all i could do to keep it running.. it would run out of fuel then load back up, defuel,refuel,defuel,refuel all the way home.. I could tell because of clear exhaust out the stack then black smoke. it was awful .. help me guys!!! is this a lift pump going bad or what ?