After tune-up no power in accerelation
replace 2 coils, spark plugs, general tune-up. changed oil, put fuel injection oil, gas saver,gas/engine cleaner. when you push on the gas padle very slow in pick up speed, even if you change gears no RPM increase. We have paid $480. to a certified auto repair have taken the SUV back but they said they performed the correct repair, could be the catalytic converter. Help please.