my gas mileage is out the window, my car hesitates after it gets to about 80 degrees outside. and it has almost no power what so ever in the lower rpm range. now i have had both of the resinators cut off my cat is still intact. i had my resinators replaced with a 14 inch glass pack. i have no clue why my car would just lose power like that. it's really bad when i have my ac on. what could it be. now i've heard that the fuel pumps in the focus's are known problems could this be it. oh yeah and i have changed the fuel filter, plugs and wires. other options?