A vacuum gauge will tell you something about the overall condition of the engine, but not much about an intermittent miss. Vacuum at or near the throttle plate may be the most accurate place for checking. BUT.... you can tell a lot about the general condition of the engine by looking at the crankcase vent. Not much blow by? Engine is in good shape. Lots of blow by? Engine getting tired. Personally, I would not go to the trouble of installing a fitting just for that purpose. A compression test will also tell you a lot. Condition of the exhaust will also tell something - is it oily? Sooty? Or relatively clean with a light coating of exhaust deposit? An intermittent miss can be caused by many things - Carbon buildup on the valves. Weak valve springs. Worn valve guides. Distributor/mag issues - like worn shafts, etc. Lean mixture. Timing retarded. Leaky ignition wiring. And, the list goes on. Some of these things will show up on a vacuum gauge, but most will require some secondary diagnosis to pinpoint.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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