Does adding fuel additives really help clean carbon deposits? Is it a waste of money or truly effective? Let's discuss, fellow car enthusiasts.

When coming to a stop, the idle speed suddenly drops and it feels like the car is about to stall. This occasionally happens when shifting from D to P while stationary. I've replaced the spark plugs, ignition coils, injectors, high-pressure fuel pump, PCV valve, carbon canister solenoid, air flow sensor, and engine mounts. I've also cleaned the intake carbon deposits and combustion chamber carbon deposits. The problem still exists. Can anyone help me figure this out? [crying][crying][crying][crying]

Should I clean the carbon deposits in my Kia Sportage manual transmission after 90,000 kilometers?

When driving the 2017 1.5T Smart model at 55 mph, the engine makes a roaring noise, but it disappears after accelerating past 60 mph. I've cleaned the throttle body, removed carbon buildup, and changed the engine mounts, but the issue persists. I've heard that reprogramming might help, but it carries some risks. Has anyone encountered this problem?

Has anyone used fuel additives for carbon deposit cleaning? Do they work well?

Fellow car owners, how do you clean carbon deposits from your car? Which brand of fuel additive works well? Any recommendations?

Does adding fuel additives really help clean carbon deposits? Is it a waste of money or truly effective? Let's discuss, fellow car enthusiasts.

How to Clean Carbon Deposits in Vitara

My Jietu X70 has run 30,000 km, and when I cold start it, the idle is unstable, and the car shakes. After about ten seconds, it gets back to normal. There's no error displayed. I left it at the 4S shop for a week, and they cleaned the throttle, carbon buildup, and fuel injectors, but it didn't help. The 4S guys said it might be the fuel, so I switched gas stations, but there's still no change. Has anyone else experienced this? How did you solve it? Please let me know. 🙏