I have a 2002 Hyundai Elantra GT 5spd with 45000kms. When I am driving the car hesitates as I get between 3000 and 4000 RPM after 4000 it seems like it has a powerband and picks up nicely.
Sometimes it also revs to 2000-2500 Rpm when gearing down.
I also notice that after driving for an hour or so at about 120kmh it runs really rough and hesitates for about a half hour after. Can anyone tell me what this might be?