I have a Mitsubishi Galant 94 V6 2000 engine, my problem is when i first bought this car it used to go through water like a boat, now the slightest rain that falls i find it a problem to drive my car as it keeps stuttering and shutting off sometimes it doesnt start back till the next day so i have to leave it on the roadside, this has become a major problem for me as i have asked many mechanics and auto electricians what could be the problem and they are baffled by it, i live in a tropical country where rain falls very often so you see why this problem has become critical, any advice will be appreciated. NOTE: I changed my original sparkplugs because i suspected them to be weak but still no improvement, no work has been done to the body of my car so no guards or water shields have been removed underneath, i have not lost engine power in any form and no other mechanical nor electrical abnormalities have been seen