I have a 95 honda accord automatic with 201k miles it drives ok on highways but when is shifting gears, the engine feels like is over-working. It does go up to 4D gear, after engine kicks in enough rpms.In slow speed limits like 35, it has a hard time going to 4D.2 garages have taken a look, could not identify problem but changed all the electrical elements related to the engine, still not fixed. Any idea?