Started my car early one Morning to warm it up.

Started my car early one morning to warm it up it run for 3 to 4 min and it started skipping and running rugged smoothed out run for about a 1 min or 2 then started running rough again and shut off. I tried to restart the car but it would only turn over and not run, so I waited a few min 5 to 10 or so and tried it again. It delayed while turning key over but finally crunk up drove it 2.5 miles and it tried shutting off again I then placed one foot on brake and other on accelerator to keep car going which was about 8 miles further parked the car and all it will do is just turn over when key is turned to crank the car. Checked the fuel line at the filter outbound side which had pressure and was getting fuel up to motor. Checked for broken or damaged lines around the engine and found a 17mm nut that had backed off of the tubing at the bottom of the EGR value which connected to the side of the motor.