I have a 2003 protege with 2.0. I just put a used engine in it and it done great for about 2 days then the overdrive light begin blinking and the transmission started shifting funny, so far I have change the fluids and replaced the speed sensors but the problem still keeps occurring does anyone have any idea what the problem could be please help

 

What fault codes are you getting?

Is the ATF level correct? Are you checking the level in Park with engine idling?

 

What ATF type did you use?