Hello, i have a 2000 civic ex 5 speed coupe with about 93,000 miles. I recently changed the transmission fluid about 2 weeks ago with Honda genuine manual transmission fluid. A week after i changed the fluid the transmission started to shudder when going into 2nd and 3rd gear. It only does it when it warms up and it doesn't happen every day. I went back and checked that i have added enough transmission fluid in the car. What could this be? How do i fix it? Any and all help is appreciated, thanks.