Fuel Issues I Think, HELP!

I have a 2001 Grand Prix GT 3800 series with 104,000 miles on it. About 3 months ago, I almost ran out of gas so I hurried and filled up. It was jerking and "backfiring" for about a week afterwards with the check engine light on.

I filled up again about 2 days ago, and the check engine light is on again. It is "jumpy" when I gently touch the gas, sputtering, bumping when I'm stopped, and my RPMs jump from .5-1.5 when I am in park. When I am driving too, the typical "Pontiac whiney noise" is louder than ever.

I have been told it may be the fuel pump, but it hasn't cut off yet.

Bad gas maybe? (It is the same station both times.)

I am due for an oil change in about 200 miles, use all synthetic, and I am due for a tune up sometime in the late summer.

Any thoughts? Advice?

Thanks!

Take it to an autozone when the check engine light is on, and post the DTC code you get.

as daejuanj suggested, pull the codes and post them. No sense guessing when the CEL could give us the answer.