My experience with a low miles M103 is that you almost certainly have to replace every single vacuum hose there is as they will be rock solid.

See if you can pull the plugs and check the condition. If they are coated in oil/black then you will at the very least need the valve stem seals done -- more likely a valve job if you want perfection.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k