You really have to do something to start ruling out possibilities.
Get a fuel pressure guage, attach it to the Schraeder valve, mount it where you can see it, and drive around.
When you step on the gas it should go up from around 35 psi to 45 psi. If it does not the fuel pressure regulator may be going out. If it falls lower, the fuel pump or screen is probably the problem.
If the fuel pressure acts normal when the stumble occurs, then that's OK and look elsewhere.
