I have an 04 MTX V6. I have lost a substantial amount of HP. I have gone from 187 WHP to 115WHP. I noticed today that i have a clicking noise at idle but when its revs the clicks become louder and kind of crack. Anybody have any suggestions to what this is?? Iam scheduled to go to the dealer in a week or so but i would like to know what the problem is before i go in and whether or not it is safe to drive with it like this. Any suggestions would help.