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Engine surging at idle

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Today my 86 720 was idling real high then cycling to a lower idle and back and forth in about a 5-10 second cycle until I shut it off. Engine was hot after a 50 mile drive and this started during the drive. I found a service manual for an 82 on this forum but it doesn't seen complete. The engine fuel section is either missing or 3 times of reading through it, I couldn't find it. I assume it's a fuel issue. I thought I heard a clicking noise as it cycled but that is hard to tell over the noise of the engine at high idle.

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