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This is probably not it, but I hope you don't have a fuel leak at your fuel filter and it is drawing in fumes or something. Sorry for the stupid idea, but it popped into my head so I'm gonna say it. :P
I would guess that you have a leak in the engine bay. Same thing happened on my olds. Just had to seal the bitch up and it was cured. I did get a little light headed on long trips though. :P