I have an 01 windstar, when i try to go up hill it kinda jumps, like it is not getting the proper gas, and when it is raining it is worse, the rpm's drop and i have to really give it gas to kick in, any suggestions,?

Going up a hill huh? I've experienced this on numerous test drives. I most always come back to the gap being too large on the spark plugs. Under load, its even harder for the spark to jump the gap. When the gap becomes too large on a spark plug, its due to wear and should replace plugs. I'd start there. The word you used to describe this, "jumps" sounds electrical to me. I know sounds pretty far fetched. :-) but electrical, ie ignitions faults will cause a sharp drop or increase in rpm, it can even seem as if it shakes. Whereas fuel starvation is more like a bogging, Its not a 100% complete drop off like electrical ignition issues can cause. I think the rain thing is coincidental. I can't think of anything regarding engine performance that rain will affect. I'd start with your spark plugs.