Code 25 Neon 95

My check engine light pop up Yesterday for the first time since i have the car. i checked the code and it's the 25. I want to know what can make the code pop up.

My car have a little probleme since 2 months. When my engine is not turning very fast and i give to much gas, for a few second, it's like i'm running on only 3 cylinders. And now(since my check engine pop up) When i dont move, my car start to shake.

my 95 neon did the same thing and it was my coil.if it still does it after you replace the coil then replace the plug that goes into your coil that should fix it!