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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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