1999 Ford Mustang car will shut off

K so I drive my car to work everyday and getting to work its not a problem it runs fine in the morning when its col and it dont heat up as much. But in the afternoon when comming home on the highway I will be going about 70mph and then it will slowly loose power then when I push all the way down on the pedel it will go no were then adventually shut off. Then when I start the car back up it will drive fine for about another 10mins then shut off again. If I do this too many times it will fail to start up. Until I leave it there for about an hour then it wil start back up and drive. I checked the coolant and its fine. I cleaned the throttle body, got a new air idle control valve, ne position sensor, new coil, wires, plugs, oil, oil filter, cleaned the mass ait flow sensor, got a new egr valve, so I was asking around and most people telling me its the fuel pump or clogged cat coverter. And I do hear a sound comming from the driver side and I had a friend check it out becasue I thought it was the manifold gasket leak but he said it maybe my cat converters going bad. So what should I do get new cats and new fuel pump? Or do you guys have any other cheaper less pricey things I can check out before I dash out all my monie.