My 1999 Cabrio does the same exact thing, and I had a tune-up less than a year ago. My mechanic suggested spraying everything under the hood with WD-40 once a month or so, and that has been helping significantly.
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Obviously water is the cause. Make sure all hood seals and underbody splash shields are in place, check firewall main connector for security. After it rains (without driving it in rain) check floor mats inside for water. A possible windshield or dash leak is allowing water into electrical area near instrument cluster (windshield may need resealed). Lift hood and look for water on any electrical connections disconnect dry, and seal with tune up grease from parts store. Good luck
it sounds like the computer is getting wet; on a clear dry day, wash the car and check for any leaks up around the windshield before drying it off especially if the water coming in on the passenger side behind the glove box because that is where your computer is located
Hi, your disributer cap must be letting moisture in or it has a hair crack.
REplace it with a new one & also spray some sort of water repellent (WD40) onto the new cap inside & out.
Also smear some grease around the rim of the cap to stop mositure getting in.
This cured a VW that plagued us every time their was either rain or fog.
Also check you rotor arm as well for hair cracks or just replace it with a new one.