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high irratic idle

Engine

Model: carrera, Year:1984, Mileage:97000, Type of use:Street use only
After 20 minutes of driving idle goes through several cycles of:2000 RPM for 10 seconds, quick drop to 1000 RPM, 5 second dwell, slow rise to 2000 RPM (over 3 seconds), hold at 2000 RPM for 10 seconds and repeat. After a few cycles it will stay at 1000 RPM.This came on suddenly with no new work on the car. It drives normally otherwise.

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