Hi I have honda city 2006 cvt GD6 , L13A engine. the car is made in thailand. the problem is with the gear, whenever the car reaches the speed of 60 kmph, the rpm going up and it will not cross the speed. I need to shift back to N then to D again to speed up above 60 kmph. what could be the problem ? No "check engine" warning signs or performance issues. recently changed the fuel pump and all spark plugs.