2002 aurora drops idle and comes back up and idle go,s down when you put on brakes

What is your question?

when i start the car it well start all right and when i put on the brakes it wants to die. and rpms go down.

What makes this problem better or worse?

putting on the brakes

How long has your 2002 Oldsmobile Aurora had this problem?

when we changed the spark plugs and valve cover gasket