Quote Originally Posted by 98GT3800 View Post
and by KR you mean knock retard, is that right..could this also be a cause of bad fuel mileage..
KR doesn't always mean bad gas mileage. KR leads to things such as loss in performance or chipped pistons. Basically Knock Retard causes predetonation in the cylinders, causing one or more of your pistons to top out and smack the piss out of the head. Which leads to it chipping, or in my case, shattering the skirt