The root of the cause is the four track recorder. But of course you know that by now I guess!
I know of nothing that will automatically sync the audio for you. It will have to be a manual job methinks. Now, if you have more than one video track to work with, you can perhaps cover the corrections with edits in the picture. If not, you'll be needing to use something like the velocity envelope in Sony Vegas to keep everything in time.
A tough one and I wish you the best of luck!
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