what should idle speed be?

What is your question?

-just had a "tune-up" (~92k mi) now idle is higher and can feel it resisting braking - i.e. when I put the brakes on it seems to not want to let engine slow down. It's idling around 1200rpm even when I turn the A/C off. I don't know if it's just a matter of letting the computer adjust to the new plugs or what? Thank you.