1998 Mustang V6 engine knocks and runs rough

[birdstash]

I have a 98 v6 mustang that ran great and all of a sudden, it wouldnt start. so, i used starting fluid and it started. It ran fine, I let it run for an hour or so, took it for a spin, and when accelerating, it made a little knocking noise. So, I parked it, and the next few times I tried to start it, it wouldnt start. When I finally did get it started, it knocks really badly,runs rough and wont stay running for more than a few seconds. I had it towed to a shop, they said the fuel pump was bad. I relapced the fuel pump and the problem persists. The fuel rails are full of fuel too. Any ideas?

[rhandwor]

Did you ever loose oil pressure?
Roll it over by hand to TDC tell use where the rotor button is located.
Did it over heat prior to this happening?

[fordtrucksonly]

Could have spun a bearing. Sounds to me that the problem lies internally inside the motor. Also, I've had bad experience with starting fluid..