[Meccathor]

I got it fixed...

I took my TCU out and followed the pinpoint check in the factory service manual. Everything checked out ok, so I put it back together and my intermittent wipers started working again...

Really wierd...

A connection must have been loose somewhere and the process of taking it apart and putting it back together had it make contact.

Thanks for all the help everyone, I hope this thread turns out useful for others.