2007 Hyundai 3.3L Rough Idle with jerk motion at stop.. Ok when running.

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2007 Hyundai 3.3L Rough Idle with jerk motion at stop.. Ok when running. Changed Spark Plugs, just added fuel injection/engine cleaner. Have seen people spending hundreds to thousands of dollars with no real solution. Suggestions are broken hoses, Vacuum leaks, EGR Valve, coils, etc. Any suggestions as to next step All are saying engine code is very vague at best, not truly identifying source of problem. Have not had Engine Light code evaluated yet