Renault Captur loss of power and car "juddering"

Can only think of water getting on electrics possibly like ignition pencil coil and cutting out a cylinder and the drying out with engine heat

It does make sense. Many thanks for your interest.

Hi there, I'm just looking for answers to my problem. I too have a capture. After the heavy rain a few days ago, i noticed when i drove it the day after, a lot of water cane out from under the front of the car. When i drive it, its starting to kangaroo. Iv took it to a garage. He said there's no faults on the car so it looks like waters getting in somewhere. He's advised me to get a sparky to look at it. Do you have any ideas where it could ge coming in x
Thankyou x

Check to make sure there is no engine coolant leak , check reservoir . Check water drains at bottom of doors are clear , clear with a piece of wire if needed . Check windscreen / bulkhead water drains are clear .

https://www.youtube.com/watch?v=1fX5P41AOMg