I need help bad!!!!!!!!!!

Okay guys here is a mind bender for you. I have a 1994 Dodge Intrepid 3.5 V6 and it has a bad ruff idle. I have replaced my MAP sensor with no change. I also disconnected the vacuum hose to the fuel pressure regulator and the idle evened out. I replaced that not to long ago. So is that the problem again? If so whats making it keep going out? Please help me with this I can't figure it out.

Check for intake manifold vacuum leaks (usually around cyl's 5 and 6), the 3.5 is well known to have the gaskets get sucked in enough to create small vacuum leak causing a rough idle, the engine usually smooths out when the car is in motion but is rough again when sitting at intersections and whatnot.

Thanks for the help that was the problem.