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Hello, my name is***** you for the question. Can you tell me if the check engine light comes on when this occurs? Does it change at all depending on if the engine is hot or cold?
It sounds like the fuel pressure may dropping off as you drive. It may also be a failing catalytic converter. Both of these are common and will cause this without turning on a check engine light.
I would drive it with a fuel pressure gauge installed to see if the pressure bleeds off. Or replace the regulator first.