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1979 911SC Running on Three or Four Cylinders over 6000 rpm.

Engine

Vehicle Information: Model: 911SC; Year: 1979; Body Type: Coupe; Total Mileage: 155,000;

When I drive my car to the limits (autocross, out an empty canyon), morethan occasionally it willstart running on three or four cylinders. This only happens when the revsare up to 6000 or overand I'm letting off the throttle. The only way to solve this is to shutthe engine off for a few seconds and then restart, then everything goesback to normal. Do you have any ideas how to solve this problem?

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