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Have you been to a dealer, or a non-specific mechanic? Do you know what scan tool they are using?
What engine do you have in your Jetta? There is a sticker on the timing belt cover that will have a 3 digit code like BPY, etc...and then the serial number of the engine.
Or you could give me your VIN and I can look up build data to be sure.
Is it only when the car is idling, does it run better when you rev it up?