Check the vacuum line at the fuel pressure regulator. Is it hooked up? Does it go to a vacuum switching valve? Is the vacuum line from the VSV connected to the intake? Does the VSV actually swich on and off? For a quick test, bypass the VSV and connect the FPR directly to the intake.

Stock setup like this: http://www.4crawler.com/4x4/CheapTricks/22RE_Engine_Pix/8.html

Modified like this: http://www.4crawler.com/4x4/CheapTricks/22RE_Engine_Pix/10.html