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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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