Peugeot 1007 motor problem in th rain

My car goes like a dream until it rains, When it rains the motor splutters, will not go above 20,000rpm.If I turn off the motor and wait for the water to evaporate or what ever it does, the car starts again without any problem.

So now I am always nervous about driving in the rain, will the car go ok or will the water hit the problem area again ????

I Know its some electrical fault , but where it is , is another question, I had it checked at a Peugeot Dealer by the diagnostic and was given a all clear ???

I have read many subject on this issue with the 206 and a lot of owners have paid a lot of money, but the problem has not been resolved.

I cannot afford to take it to the garage and pay a lot of money and not to have the problem fixed. So I frequently check the wires and see if I can figure this out myself, but now after owning this car for 6 years I still have not found the rootcause.

If anybody has had the same problem and found the cause , without taking the car to a garage I would be really grateful to know , how to slove this , as its really "DOING MY HEAD IN ""