I own an 06 GT, and recently have installed a 4.6l twin 62MM throttle body from BBK. The engine always ran at perfect rpm before installation, when I jump the gun from 1 to 2 I noticed rpm level takes awhile to decline(or longer than usual that is.) I know this is a common problem and there could be several issues, whether the computer just needs to adjust to the air intake( only has been installed about a week ago) but I have only driven a few times and noticed. So any advice guys?