a slight revving when idling.

did you get the problem fixed?just kidding about the engine 4.6L!!

No just started today to make inquiries. I'll try what you suggested and let you know what happens. Thanks!

is the check engine light on?if so get the codes read and post them here.

No, the engine check light is not on but I have one of those checkers and tried it anyway it shows no code.