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 - Using Your Tractor: Creating a Seed Bed - by Chris Pratt. When I bought my first old tractor, I had only one idea in mind. It wasn't the preservation of old iron since at that time, I was unaware that people even did this. It wasn't to show off my restoration skills (though I had tried my hand at a couple of old motorcycles in my teens and if I recall correctly, those old motorcycles were sold in boxes about one quarter finished). It wasn't to relive memories of Grampa, Dad or myself out on the back 40 nursing the Farmall pulling too many b
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