No problem. If it is coming from the back of the motor towards the firewall, it could be as simple as the lines right there are split or have a small hole. It could be the FPD since they fail easily. You could eliminate it, i still havent and i have a FPR.
Are you still seq or non seq? Just be careful when you pull the vac lines. twist off dont pull. Ill help you out, no problem.
by the way mike you dont happen to have a passenger side mount?