On my 2001 GT it idles fine with no AC or Heat on at 755 rpm's. But when these are on, the idle will jump up 200 to 300 rpm's and then go back down every 10 seconds or so. It's almost like the power isn't there. The car has 45000 miles and has xpipes,cat back,Predator tuner K&N Filter. Any ideas?:eyepoppin