Where is the fuel pressure regulator located on a 1996 jeep grand cherokee laredo 6 cyl.?

I am at a dead end and I'm going to try to replace the fuel press. regulator. Cant figure out what else is wrong, have changed all but 2 sensors. Jeep dies out at stops and sputters and dies out while driving. sometimes sounds like those old cars when turned off they still try to run. My fuel pump is running I can hear it so I'm going to change the FPR but cant find it! Anyone know exactly where it is located and size. it's a 2WD 6 cyl. 4.0 thanks