1986 Nissan Maxima Acceleration issues

I have an 1986 Nissan Maxima wagon which I would love to keep running as long as possible. But recently some issues have popped up. Usually whenever it rains or I drive through a puddle, my car seems like its bogged down and it has trouble accelerating. The car jerks a bit and eventually it will even out until I stop where then the engine sounds like it wants to die and starts sputtering. But now, If it rains my car wont start, and when its completely dry out my car will have trouble accelerating as if it was raining out. It happens at random times or just wont happen at all. But now its getting bad to the point where I will drive up to an intersection after driving around with no problems and then wen the light turns green I have trouble driving over 5 mph though the intersection. I don't know whats wrong and its starting to worry me