Engine shuts down on start

I'm having the same problem at any rpm even if i give it gas, it does it at any rpm then it will turn off and be hard to start like its the fuel pump but it will only do it in gear (as soon as it goes in gear forward or revers you feel a little boble in the rpm then when you start letting out the clutch it starts missing like the fuel pump is bad i tried disconecting the trany reverse switch and it did the same thing any help would be greatly appeciated