My 1998 Volkswagen Polo 1.4 CL loses power in the wet. Any ideas why this might be? It started happening after driving through a particularly deep puddle in the road. Then, once again, following a down pour, the car just ground to a halt losing power and the AA had to tow me home. Stopping halfway due to the AA man reaching his maximum miles, I tried the car again and it was fine, so I drove it to my destination.