i change my engine cause my old one timing belt bust. so i bought a use engine [not transmission] . when i drive the car, IT would hesitate a little and then drive, only to realizes that the car is driving on the 2nd gear and sticking on the 3rd, it will not go over to the 4th, but the engine will rev all the up until i take my foot of the pedal. sometimes it will drive normal like start of in the 1st or if i stop and start the car about two or three time it will drive ok. the thing i don`t know what is causing that CAN ANYONE HELP ME OUT