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cruise control

Engine

Model: 911 , Year:1985, Mileage:104000, Type of use:Street use only
At highway speed I sometimes get a stumble or miss. It happens unfrequently. However, I can make the same thing happen if I use the cruis control. At 40 mph with cruise on th car hunts around and speed varies. At highway speed, the stumble returns and the car bucks pretty good. Any ideas?

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