just got done rebuilding the motor and started it for the first time today and i put a CAI on the car. it idles at 2000 at start up and 1500 when its warm but why letting it warm up there was a growl coming from the cone filter not all the time every so often for about 10to15 seconds at a time and when you rev it the idle does not come down right away and when i shut it off it made a goose like sound from the air filter. any advise would be great. thanks.