Example of Google Indexing my Feedburner Links
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As you can see, there are 2 results for the same page.
One is the correct page URL, the other has the Feedburner parameters at the end:
Can this cause duplicate content issues? Can I prevent Google from indexing my Feedburner links? My Feedburner settings are already set to noindex, what else can I do?!?
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You will never see the second one (as url) ranking above the first - so no issues there.
Google ranking system is ok with dealing with this type of things even if the Google bot isn't and it puts everything into the index

Just to sleep well I would post this question on Google forum and wait for someone in Google to assure you it's fine.
I would't worry a bit.