The car starts up normally, but the idle is sort of rough and irregular. For about 2-3 minutes after startup, there is absolutely no power. It doesn't shut down but the engine barely responds when I step on the go pedal. Kinda scary, cause there is no response at all. Then suddenly, the engine smooths out, the revs spike up just a little, then responds and runs normally. No check engine light (thank goodness)

This didn't start happening until today. When I filled up today, the gas pump nozzle did not shut off automatically so I think the tank was overfilled (not a good thing, I know). I really suspect I got some bad gas. The car has never run like this before. Its always been smooth and powerful.

So given no CE light and the gasoline issue, what do the symptoms sound like? Bad gas or something else? I put a bottle of STP water remover in the tank and it does seem to help a bit. I know if it was the fuel pump, the car wouldn't start at all.

1998 V70 GLT