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Engine revs when idling

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When the engine is warm and I'm idling, the engine revs subtly. It sounds like I'm rhythmically tapping the throttle.

I have a 1981 diesel rabbit pickup. It seems to run smoothly when I'm driving around. But when I'm stopped and the engine is idling, I hear it rev slightly, and repeatedly. It sounds as if I were tapping the throttle every 2 seconds. I don't hear any irregularity while driving around. What's going on?

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semi-restricted fuel flow….
Try a new filter first….

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They all start with GOOD Grounds.

Where are my DIY Links?

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Briano1234 That sounds like a good place to start. Is it normal that it would only be noticeable while idling?
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