I can almost guarentee its your coil. Heres how...
Mine did that for over two years. It HATED water. I'd even splash through a little puddle and she'd sputter like running out of gas for a few minutes to follow. Sometimes even in heavy rain. It would never stall completely, just act like it wanted to.
Eventually I found by spraying water under the hood that when it would wet the coil, it would sputter like that!
So, I replaced the coil and have since splashed through quite a lot of water without one small hickup. I also found the coil was pretty bad looking, the metal was starting to rust apart and was cracked pretty bad.