Rudy,
If you have a bad case of carbon build up I would suggest you use either 3 cans of SeaFoam or the 3 pack from B&G. B&G is by far the best and costs more, but SeaFoam will do a pretty good job also.
With either of the products, one can goes in the fuel tank, one in the crank case and one thru the induction system( intake manifold). Make sure you start with a fresh oil change and change it again as soon as it gets dirty, usually around 1000 to 1500 miles. When you do the induction cleaner, clean the throttle body with some carb cleaner and a rag, then do the induction cleaner slowly over 3 or 4 minutes. Shut the engine off as soon as you are done with the induction cleaner and let it sit for 1/2 hour before hitting the road. Be prepared for a lot of smoke for the first 15 minutes of driving.
With any of them, plan on doing it when you have a full tank of premium and 2 or 3 hours to go drive.
Don't use Avgas, you will burn the valves and screw up you O2 sensors.
In the future, depending on how much you drive, throw in a can of SeaFoam or B&G in the fuel tank, once or twice a year, your truck will continue to run strong.
Good luck,
Mike J.
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