Green93

Hi guys. Like everyone else, I've been trying to track down a rough idle. Today I hooked up a vacuum guage in the engine compartment. My engine runs at about 11-12 at idle but when the brakes are depressed drops to about 10. Is this normal? What is the normal vacuum for the 3.0 at idle? I'm running out of things to check on this engine.

Thanks for any help,

Jason