Yes that would be my suggestion to help eliminate possibilities. (plugs and coils won't hurt at all as a starting point (thanks VW for the new coil packs! 2006 build)
But the only time I ever the idle and shudder issue is when I wasn't using BP Ultimate consistently with no exceptions (jimmy's recommendation). I would sometimes use Shell 98 and that was undoubtedly the issue. Haven't had any dramas since.
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