Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down?

Pushing the gas pedal has no effect on car speed.
Car will not catch up with speed while pushing accelerator pedal.

The problem you are describing sounds like you are suffering from a lack of fuel pressure due to eaither a restricted fuel filter or a failing fuel pump and or both.Start with installing a fuel pressure gauge to the fuel rail service port and monitor fuel pressure when the problem is occurring. You need to see 30 to 45 PSI, anything less replace the pump.

A failing fuel pump tends to overheat and this cause the fuel to foam and this cause the lack of power and the stall and then a no start. Often times, once it cools off it will start and run again. Its usually the in tank lift pump that fails. The pressure test would be the place to start to know for sure.

This details will help.

Thanks.

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