1994 Other GMC Models GMC G3500 Vandura 1 Ton Van 5.7L Fuel

Engine Mechanical problem
1994 Other GMC Models V8 Two Wheel Drive Automatic 112k miles

Hi,

My box van/truck is stalling, especially when giving it gas. I noticed that the power was going in & out, so to speak, a few days ago when driving. It'll start up fine after sitting a while, I'll put it in gear (still idling fine) and then as soon as I press on the gas it stalls. Then, in order to start her back up, I have to press the gas all the way down to the floor. So, I've decided to replace the fuel filter which I thought would be easy, but now I'm hearing that there's 2 fuel filters.

I located the spin-on fuel filter right by the gas tank (Napa Gold 3124), but I understand that there's supposed to be another fuel filter on this vehicle. Is it inside the carburetor? Does anyone have the part number? Any tips on what else could be causing the problem?

Thanks!