1997 Chevy Suburban performance issue (hesitation)

Engine Performance problem
1997 Chevy Suburban V8 Automatic 174000 miles

I have 1997 Chevy Suburban 5.7. I recently bought it and have had many problems. Last week I had the radiator replaced including the hoses, the intake manifold gasket replaced, the heater hose connector replaced. I believe they also replaced the distributor cap. It drove fine on the way home. It sat for one day and when I went to drive it, it kept hesitating and the service engine soon light came on. I thought maybe it needed gas because it was a little low, but not in the red. I put half a tank in and drove it around for about 10-15 minutes and it started to drive fine and after a while the service engine light went off. It sat for one day again and when I went to drive it, I had the same problem again. My gas gauge said I had a quarter of a tank left, but I still put in more gas. It also died on me while I was idling. It did not do this the previous day when I drove it. I drove it for about 10 minutes and the problem didn't seem to be going away this time. And I did not have this problem when I took it in for the radiator. The only problem was the overheating at that point. I have also had the starter replaced, a new 7 year battery, new serpentine belt and tensioner. I also have the paperwork form the previous owner and they had the fuel meter body (what it this?) And intake/fuel meter body gasket replaced in 2006, cat. Converter replaced in 2007, spark plug, dist cap, rotor, and wires in 2006. What could be causing this all of a sudden? I just noticed that while the car is on, I hear a buzzing sound coming from the gas tank. Thanks