93 Plymouth Laser runs and drives fine until warm then runs rough?

I just bought a Laser. The car runs great when its cold. But when it warms up it starts running real rough and if you give it too much gas it just bogs out and wont go no where. But when you give it just the right amount of gas it will go with no power and spit and sputter. What could cause this? 2.0 DOHC 5 speed