1996 5.7 fuel regulator

i have a 1996 350 and went to replace the fuel pressure regulator. My question is there supposed to be a vacuum line going to it? It has the nipple on it but I don't see any lines inside the intake for it to hook up to. I had this truck for 2 years now and has always done the hesitating. Changed all of the usual stuff( plugs,wires,cap and rotor, fuel filter, and o2 ) but still hesitates. Any other ideas on the vacuum.

No vacuum line on this design. See http://www.automotiveforums.com/vbulletin/showthread.php?t=633543&highlight=fuel+pressure+regulator

//2000CAYukon

Thanks for the reply, I'll throw it back together and hope for the best. By the way, any ideas why it would be hesitating when I step on it. Already changed the fuel filter, plugs, wires, cap , rotor, o2 sensor, and still comes up with random misfires. no. 3 was the worst one with over 200.

Thanks for the reply, I'll throw it back together and hope for the best. By the way, any ideas why it would be hesitating when I step on it. Already changed the fuel filter, plugs, wires, cap , rotor, o2 sensor, and still comes up with random misfires. no. 3 was the worst one with over 200.

A leaking FPR can cause a misfire.

Other things that can cause it:
- worn out dist drive gear
- worn out spider (note there is an upgraded spider that converts from central port fuel injection to multiport fuel injection)
- intake manifold leak

Good Luck,
//2000CAYukon