my truck is a 05 ecsb silverado with a 4.8 and about 87,xxx miles on it. the ole girl seems to be losing some power and a tad bit of gas mileage. im getting right under 20mpg with a k&n intake and aftermarket exhaust but i have never brought this truck to a shop to get tuned up. i havent had one problem with her yet. what i am asking is what is considered a basic tune up for a truck?? id like to do it myself instead of dishing out all that money for a shop to do it. i am also looking into the nelson performance tunes. i heard great things about them. thanks ahead for the suggestions guys .