Check the vacuum line to the fuel pressure regulator and check to see if the fuel pressure regulator has gone bad. Give the throttle body a good cleaning and the injectors too. Do not use carb cleaner, it's to corrosive for the gaskets used in the throttle body. The other thing too that would cause this is a stuck or bad EGR valve, Try cleaning the EGR valve too since your cleaning the throttle body. Good luck and keep me posted.
Any parts store like Auto Zone will carry numbers of injector cleaner and throttle body cleaner. They are all similar, i use what ever is on sale at the time or the best buy for it's size. I know Auto Zone has loner tools and you can see about using there Fuel pressure gauge, it only take about 5 min to check the fuel pressure and they's will have the specs to the fuel pressure.
If you do remove the EGR valve to clean it, buy a new gasket. Be glad to help.
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Thanks for the reply. What would you recommend I use to clean the throttle body and injectors?
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