My girlfriend's 1996 Golf (4 cyl) has become unreliable in wet conditions. So far, mechanics have replaced the distributor cap, spark plug wires, and ignition coil in attempts to fix the problem. They also replaced or checked the spark plugs. These all seemed reasonable to replace given the age of the car.
During the last heavy rains this weekend, the car lost some power and the check engine came on. I'm guessing that this is an ignition problem since it seems to only happen in the rain. By Monday morning the check engine light has gone out and the problem appears to go away.
Besides the replaced components, what else can be checked? Is there anything particularly susceptible to problems with these engines?
Thanks!