Honda Element Engine Low Power

I Have A 2005 Honda Element, Which Very Recently Had Its 100k Mile Service And Was Fine. When Reversing Into My Garage Yesterday, I Suddenly...

Just As Background I Have Already Replaced The Spark Plugs, Fuel Injectors, Fuel Pump And Water Pump. When Starting The Vehicle, It Will...

While Pressing On The Gas While Driving The Car Wouldn't Move, ( The Gear Was On Drive) It Just Moved Back While I Was On A Hill... I Can...