1988 V12 with about 50k miles. Car is totally tuned with new ignition/fuel system, and timing is spot on.
It idles decently, but I only get 16 inHg at idle. The vacuum gauge needle vibrates super fast right on 16, but evens out as I give it more rpm. Reading about this symptom, it states this is due to bad valve stem seals, or worn cam lobes. The car burns no oil at all.
This car had been sitting for 7 years when I bought it last year, and ran terribly rich before I had ignition and ECU fixed. I have been unable to give it an Italian tune up yet.