Welcome back to the forums gtigirl, please take it to volkspower or whoever installed the apr flash. They will be able to test it, flatspots can sometimes be tuning.
Before you take it to VW try to disable the APR flash or remove it, because I'm sure VW wont do anything under warranty after they find the APR flash there... esp if its to do with the engine.
Good luck,
BLKMJC
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