Have you had the front wheels balanced? Sounds to me like you either lost a weight or have a flat spot. I'm not sure why it would come and go - that doesn't make sense to me.
When I bought some new Gforce Sports, one of them was out-of-round from the manufacturer (never buying BFG's again!) and the sensation was very much what you're describing.
I vote for taking your car to a competent shop that can do road-force balancing and find out if one (or more) of your wheels is out of balance...
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1999 Carrera 4 • Aero kit • 4" UD Pulley
My Corvette doesn't leak oil... it sweats horsepower.
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