Quote Originally Posted by SlowNA06 View Post
EGR stuck open will make it run rough at idle and lower gears. Cruising in 4th gear, it shouldn't be a problem. Basically, it's making a huge vacuum leak and making the engine run toooooooo lean. Which means you're hurting it. Get a junkyard EGR and swap it (or pull your and see what's holding it open), or ask Bill nicely if he's got a spare to send you.
Interesting. Would that throw a code? If no code is thrown does it mean its not severe?