HI folks, as the title suggest I have a 2008 Nissan maxima and It won't go faster then 2000 rpm when I check under the hood the throttle body doesn't open changed it and still won't open the bcm is burn out and changed the fuel pump and it sill wont move any gas at all I'm stuck and don't know what to do now

 

Check the mass air flow sensor.

 

That will stop the fuel pump for pumping