I would definately get a Fuel Pressure Regulator. It helped me out a lot. You could just go to an autoparts store and pay less ($80), but maybe wait a day to get it, or go to the dealer, they should have it in stock and it will be about $130. There are 2 different types of regulators, and one isn't on certain years and not on other years, it seems to me that they are all just different, don't ask me why. I went to Auto Zone or somethin and they had one in stock and it wasn't the one I had to it helps if they have at least one of them in stock so you can tell if it's the right one or not. I am pretty sure they can order both of them and then you can buy the one that fits yours.
Location:
In case you don't know what it looks like or where its at, I will try to tell you where it's at. If you're right in front of the car with the hood open, look at the intake manifold. There are like 3 curves that bend down to the left side. Look right at the base of the one closest to you, there should be something bolted right to it, and there should be a fuel line (has a braided steel covering on it) going to the top of it, that is your regulator. I think there are 2 bolts that mount it , one of them is easy to get, the other isn't so easy. Be sure you releive the pressure in the fuel system before you take off anything on there. To do this take off the passenger side kick panel, and then peel back the carpet. Right where the passenger's feet would be, maybe a little higher up is a little electrical connector, just unplug the thing and then tyry to start your car and it shouldn't start, then it's safe to work on. To reach the two bolts that bolt the regulator to the manifold/fuel rail I had to take off the upper raditor hose, you have to drain some of the coolant out of the radiator. If you need to know how just aks I'll tell you if you need to know. The whole thing, including draining the radiator took me about 1 hour and 30 minutes, and to put the new one only took me about 30 minutes or so. Hope that helped you out.