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There is a fuel cutoff set by the cars computer that limits the RPM's of the engine to prevent engine damage. If its cutting out below say 5000 rpm, then theres a problem. The check engine light being on steady means one of the sensors detected something the computer doesnt like. Get the car to a good mechanic to scan the light and retrieve the trouble code. That will tell you what the problem is. Some auto parts stores, like Auto Zone, will scan the light for free.