I've replaced all my vacuum hoses, and intake plenum gasket. I've replaced the TB gasket, also have made sure I don't have any leaks in the intake hose (Mine is aluminum tube). I've replaced my PCV, and PCV grommet.

I've used a propane torch, like I usually do for leaks, as well as carb cleaner and water.

I still feel that I may have a vacuum leak because it runs good in open loop and bad in closed loop. The open loop runs richer and overshadows my vacuum/lean mixture.

Can the fuel pressure regulator itself cause a vacuum leak if bad? What other things do I need to look for?

Any help would be great. Thanks.
And nice new "smiley".... :wabbit2:

 

Brake booster?

 

Good call, never checked that one