[BrianC302]

Wow its amazing you made it this far. You must be using a clean premium grade of fuel. In any case here is where i would start.
1. A good dose of fuel injector cleaner. Lots of good brands including Techtron [dealer recommended] available at Walmart for about $8. Also STP high mileage fuel injector cleaner.
2. Then add a full can of Berrymans B-12 in full tank of gas. In fact I would do this for two tanks of fuel.
3. Next will be to attack the accumulation of carbon on the back of your intake valves. It's not difficult to do you just have to follow direction on the can. Spray can version of SeaFoam. Again from Walmart about $8 bucks

This will be a good start, After that a good maintenance schedule is recommended and that is going to be something of a personal preference. In every tank of fuel I add 4 oz of Marvel Mystery Oil + about 3 oz of fuel injector cleaner. Before every oil change I do a Techron treatment as recommended in my manual and by the dealer. My Kia is running just fine. That is what I do but everyone will have a differing opinion A few bucks spent at Walmart to me sounds a whole lot better than $1000 at dealer. Have a great day.

We are at 105,000 and ours runs like new. I don’t think it is all that amazing…. Run top tier fuel more often than not and just drive it. I think people make carbon issues way worse in their minds than it is in reality.