How much to clean throttle body

Hello guessing at "cleaning the throttle body" isn't helpful. This is not likely a source of your concern. Your concern is likely related to a vacuum leak or un-metered air leak causing the engine to run lean on fuel and stall. But this is a total guess and diagnostic testing with proper equipment is needed to find out what is missing from what your engine needs to run properly when the problem occurs. https://repairpal.com/repair-shops/hyundai-repair-and-service-in-placentia-california