sounds like the vent for the filler neck isnt doing its job of relieving pressure as you fill up. might have something to do with evap code as well. take a look at the filler neck under that stupid plastic guard in the wheel well. evap can is back there too. seen it before when its dryed or weak from topping off all the time. and the hose collapses.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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