fuel pump out and look in your gas tank to see if there's rust. Check inside the plastic tray in there and if you got rust/gunk sitting on top of the fuel pump pick up sock you may have to recoat the inside of your gas tank or get a new one. I had the same problem so I just took the fuel pump out and took both drain plugs off and flushed all he rust out I thought it was clean but it still ran like crap so I reluctantly had to drop my exhaust and subframe to get my gas tank out to recoat the inside only cost was $50. Runs good now. I hope that's not your problem maybe its something else, but it's definitely something you should check.