Weird problem! car wont stay running. please help

[eagle talon guy]

So 2 weeks ago, my car died as I was driving (I was slowing down and about to take a right turn). Then it wouldn't start! So I got pulled home, and on the way I tried popping the clutch to start it, and it took a couple tries before it started, but it did start.. so then I got home and I shut it off and started it 2 more times.. Then I started it to go somewhere, and it ran for a few seconds and then died. and then it wouldn't start after that! then I let it sit for a while, and I tried to start it, and it started. but then it died. so I figured maybe it was the fuel pump. Got a stock one and put it in. but when I was tightening the bolt for the positive wire on the pump housing, it broke the stud.. so I rigged it by using jb weld. so that lasted a week, and then it came undone. but I picked up a walbro 255 that day. so yesterday, it died and did the same thing as I was slowing down to take a left turn.. (btw, I had drilled a hole where the stud was and put a screw in, so the connection is good) so I put the walbro in yesterday. then it started and I thought it was good.. I let it run for a bit to make sure it doesn't die, and it didn't. so then I went to go somewhere like an hour later, and it started, and then a couple seconds later, it died!
WTF could this be!?!
I am so lost as to what could cause this.. please help and let me know if you have any ideas as to what it could be..