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A vacum leak can cause the system to run rich, along with a million other things. A temp sensor could cause it also. Also, incorrect ignition timing.

On my '84, the leak that caused those symptoms was the vacum line that ran between the rear of the throttle body to the cam cover. Luckily regular hose from the auto parts store could be adapted.

You might also check all the accordion rubber hoses and the plastic thingy on the intake that runs over the top of the engine. You will need to pull it off and check all around for cracks.
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