theother1wstolen wrote:...try hooking up some butane or propane or something of that nature to a small tube, and see if when you put the tube near those if it starts to rev a littler higher.
You might want to try something a little less explosive. Some people use carb cleaner and others use starting fluid (spray). The point is to use something that will burn and alter the RPM when sucked into the intake through a leaky vacum line.
I would hate to see what a leaking plug wire would do with an engine bay full of propane.