Hey folks, thanks for this great forum. I have 08 egc with stage one upgrade, hooker true duals. I usually change spark plugs every other oil change. I notice the fuel mileage has fell off a little, and sometimes it just does't seem to be running right. No missing out or anything, just sluggish. When I changed the plugs this time, it seemed the rear cylinder didnt burn as clean as the front. I was wondering what is invovled in a tune up, other than plugs. Do I need to have it put on the dyno? From what I've read here, I'd rather not. Any helpful suggestions are appreciated. Thanks guys.