You have discovered the idle bounce for our vehicles. Grats!
LOL. Could be one of like 10 diff things.
Do a vac line test. spray carb cleaner around the lines you just moved and replaced. if the idle clears, you've found your problem.
Don't forget to spray some near the EGR return into the intake, that SOB works lose all the time for me.
My guess? Intake Mani Gasket is cracked and leaking since you were just fiddling in that area.