I having a problem with idle surge (rpm bopuncing around 600-900RPMS) and low vacuum (15hg). The surge seems to happen more after a hard run or longer trips but I'm always pulling the same vacuum at idle except when the my idle is bouncing, then the vacuum jumps around with the idle. Everyonce in awhile the car stalls, then after its restarted I can smell fuel and see the cloud. Is this just a vaccum leak or could it be a bigger problem?
The turbos are working right and if it matters the car is stock except for a full 3" turbo back exhaust.

 

mods?

 

So what's an under-hood examination yield?

 

I took a quick look under the hood but didn't notice anything. This problem has been around for a few weeks and it starting to get annoying. Its almost like the cars running really rich. Its just strange that I can drive it for 30 mins on the highway at normal speed and the idle will be fine when I stop. But if I drive it kinda hard or take a long trip the idle becomes unstable. It goes back to normal after a few miles of driving around town.
The car is stock except for a full 3" turbo back exhaust. I know I know but I don't have an ecu your gonna blow your motor. I've just been driving the car 2 miles to work and haven't even boosted it. I've had this problem befor the cat was removed.
I'm starting to think it might be the egr causing the idle and running rich and the vacuum thing but be a completly different thing.
Any ideas?

 

I don't think you got a vacuum problem, something is up with your air pump and or the emission crap.
When your car runs fine just remove air pump realy or even better just disconect it by the crosover pipe is the connection and if the car starts doing the same thing than your air pump is gone or bad connection etc.