My car is losing power especially when a/c is on it will not even go up a hill. on 2002 Ford Focus

Replaced throttle position sensor, mass air flow sensor and still no power can literally push gas petal to the floor and won't move, just inches along. Put a/c on its temp goes to red line to overheat it idles way high and then way low and just jerks hard when you drive to go into first gear not to bad after that. Battery is OK.could it be fuel pump?

Asked by for the 2002 Ford Focus
its a 2002 focus... stop putting good money after bad... sell it...