Diesels "sounds" different, seems rougher - Low sulfur fuels?

I was going to post anyway, but seeing a couple of the low sulfur fuel threads got me thinking that it seems to have been accompanied with a different "sound" to the engine - more of a "chugging" sound than what I
have been used to - the knocking sound of the explosion in the cylinders.
The car seems to be a tad rougher, but not much, and the pickup seems as good. Starting in cold weather perhaps a bit more difficult, but all in all no super big changes.
The change in sound I just noticed over the last couple of weeks, as I finally filled up with the new fuel.
Any similar experiences?
Thanks
tweaks
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I heard you have to run diesel injector cleaner to fix this problem... will do this when I get my car back.
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Thanks - I'll try that tomorrow.
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