Stalls out after a few seconds, can't keep her running

[budzag]

92 Camaro RS v6 - High miles (over 120k) - Off and on, it runs fine, but then will bod down and stall out. Yesterday morning it stalled out while driving normal (45 mph) road speed. Wouldn't re-start. Turns over well, and occasionally will start, but stalls out again after a second or two. Gas is at 1/4 tank, a lot of people have looked at it since these problems started a few months ago. Fuel pump fuse one time, ignition coil, spark plugs, wires, fuel filter... many little things have been replaced. The last mechanic to look at it suggested it might be the fuel pump, given the miles it has.

We live in South Florida, where it's hot most of the time (just for extra info pertaining to performance issues). My kid (he's 20) drives this to work 25 miles each way, and anything to help diagnose his would be greatly appreciated. I am mechanically inclined, and have handled many issues with our vehicles in the past (and I'm a quick learner).