Hi Guys,

I own a vw polo 6n1 1999 1.9sdi.

It is happening often that when its heavy rain the engine rpm drop suddenly to approx 200 and the engine is almost dying, then after 10 sec it goes back to normal.

I was driving for 100 km during heavy rain and this happened more than 15 times.

Could you please tell where and why is this coming from??? Is there any damage that can happen to the engine???
Is there any connection with the engine air filter which is located at the bottom near the ground.

Thank you for the support.