What are the hazards of throttle carbon deposition? What is the approximate cost of cleaning up carbon deposits?

What are the hazards of throttle carbon deposition? What is the approximate cost of cleaning up carbon deposits? My car went to 4S for maintenance today (it ran away 18000). The maintenance staff said that cleaning the throttle valve cost more than 400 yuan. I thought it was a little expensive, so I didn't do it, but I still want to know if cleaning the throttle is really so expensive.

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What are the hazards of throttle carbon deposition?

If there is carbon deposit in the throttle, the oil-gas mixture is not good. Clean the throttle valve 100-500 yuan.

Single cleaning? But I don't know what the carbon deposit on the throttle is, so I always have to spend money to clean the throttle. Because the throttle itself does not produce carbon deposit, it is because the fuel is not fully burned to form carbon deposit. ? Now introduce a fully automatic method for cleaning carbon deposits = = Cleaning carbon deposits without disassembling the machine = = "Cheyoubao" comes from Taiwan Province Province ===30? Ten thousand kilometers of carbon removal, fuel saving, no tail gas.