While I\'m bothering you guys.......... One other wierd thing about my 84K5. Ever since I ripped out the emissions, once a month or so I find myself cleaning what looks to be a carbon buildup off my rear bumper right behind where my exhaust comes out. I have the usual "puff-o-blue" valve seal problems, but the truck doesn't use much oil for a motor with 207,000kms(129,000 miles). Any idea where this is coming from? Is it linked to the problem in my last post?