When I press the gas it doesnt Move

Basically my car starts and I start driving then 5 mins later when I press the gas it just wont move. Then I turn it off then back on and 5 mins later it does the same thing. So the 1 st man told me that it was the fuel filter, so I had that replaced but it did the same exact thing. After that they cut the exhaust pipe off my car thinking it was clogged, but it still was doing the same thing. The other man said it was my throttle actuator but I dont think my car has a throttle actuator. I really need to figure out whats wrong and ASAP please!