My wife got in her car 96 Buick 3800 at work and drove to Mcdonalds drive thru
1/4 mile away. As she sat in the drive thru . the engine stalled. She restarted it and went to a parking space and called me. I went to check it out. After looking for any obvious signs on trouble under the hood. I started it. I would only idle for a few seconds and stall. At half throttle it will rev up and down up and down, like its getting just spurts of fuel. I put my ear to the tank filler neck as she turned the key on and I can hear a whir but it is awful faint. A buddy with an old roll back will pick it up and bring it home today and I will put a fuel pressure gauge on it . The fuel filter was recently replaced. I don't have an OBDII scanner. Before I spend 90 bucks on a new pump, I there anything else that would cause this?