Rough idle when stationary sounds like its going to cut off, what is the cause? on 1997 Dodge Caravan

When the car is sitting still, the car has a rough, low idle like its going to cut off but the engine doesn't cut off. However, it only does this when the engine is warm, so starting it in the morning the idle is high and doesnt idle rough. I have a 1997 dodge caravan base model with a 4
cyl engine. What could be the cause?

Asked by for the 1997 Dodge Caravan