Honda Hunter

I'm getting this code. If I drive the car cold it stumbles in gear and only has 2 gears and wont downshift and acts like it wants to shut off. After the car is warm if I shut it off and restart it itll shift through the gears but really fast and wont downshift out of od. I ordered a new wiring harness and auto harness to replace the wiring but havent installed it yet. I tried replaceing the shift soiliniod but it didnt help. Also the car shifts really hard now. What causes this and what's the fix? Car is a 98 camaro.