Help with accelleration

I'm a yutz when it comes to automotive repair so please bare with me.
95 MX with 95K.  It's had pretty good maint during it's life.  Turns
over with less than one rev of the engine.  However, after driving 4-5
miles, it spits and sputters.  Keeping the peddle to the floor, it
eventually catches for a bit and then back to spitting etc.  Plugs,
air, fuel are perfect.  A neighbor backyard mech. suggested TPS?
Throttle Positioning Sensor?  Does this make sense to the experienced
owners?  Any other areas to look into?
Thanks in advance.  Bill McDonald