Re: vacuum gauge as diagnostics tool
A cheap undamped vac gauge will always fluctuate every time a valve opens.
You are looking for irregularities as the engine goes thru its 4 cylinders firing.
A fast regular flicker of a cheap gauge is normal.
If you want to learn and play with a vac gauge, set revs to about 1200 and then move spark lever, the results will impress you.
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