I have a 2000 honda accord ex coupe 4 cylinder. The problem started 3 days ago when it seemed like my car was having a hard time shifting into higher gears and the rpm's would shoot up real high like it dropped a gear all of a sudden. The car will seem like it loses power and then seems to pop or slam back into gear. Last night my "D4" light was flashing while I was driving even if I put it in reverse. My check engine light and maint. required light both came on. the car drives pretty well when it is cold but once it heats up then the problems start showing themselves.