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Welcome Rob:
It could be 2 things.
First like bill said, the vacuum line may have come off or loose. Even if they look connected press them in good. Also make sure rubber connectors are not cracked.
Second make sure that all the connecting rods( linkages) that you took off during removal of valve cover are reattached right.
Good luck.
MVK
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One penny saved is three penny earned.
1985 300D Turbo 179,000miles
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