Originally Posted By: Vikas
If you are convinced it is carbon, then there are professional (or amateur) ways of getting rid of them. Look up "Motor Vac" treatment in your area. It might cost you hundred or two but if anything is going to decarbon your engine, that would be it. BG also has similar service.
You can try to duplicate it yourself using Seafoam or even water but the question is do you feel comfortable doing it? If not, let professional do it.
GreeCGuy just posted how he fixed his van using home made decarbonization. You do read other topics here, right?
Try the $20 Walmart service and run a tank after because they will add a cleaner to your tank also.
Then add Techron to the next tank.
Take a look and clean your TB too. If it has carbon, then it is elsewhere in the system and the Walmart service should take care of a lot of it.