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1990 964 Hard to start and runs rough after driving in the rain.

Engine

Vehicle Information: Year: 1990; Body Type: Coupe; Engine (type, size, modifications): 3.6L, tiptronic; Total Mileage: 80,000;

Recently I drove my car for about 6 miles in a hard rain and parked it for about 45 minutes. Upon returning to the car I found it very hard to start. It would fire and then immediately die. I tried for about 1 hour to start it and keep it running without success. I returned in about 4 hours, and inspected the main distributor cap and found a little moisture inside. I dried it out and was able to start the car however it would try to die when I put it in gear. I was able to drive it home and let it sit in the garage for several days. After this time it would start but still run rough and tend to die.The contacts in the distributor seem to be fairly pitted. Also the rotor contact seems fairly worn back, almost flush with the plastic housing.My question is How does moisture get in the distributor cap? Through the air ventilation hose? Can moisture also get into the secondary distributor? I was not able to inspect it since I found it hard to access the back screw. Could poor starting and running be due to worn rotor and cap? It was running fine before the rain incident. Can moisture cause the distributor drive belt to slip? Are these cars normally prone to problems in wet conditions? If you can help me solve this problem it will help me avoid trailering the car 60 miles to the nearest Porsche mechanic in Houston. Also, is there any trick to removing the plug wires from the distributor cap. They are attached very tightly.

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