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Old 08-02-2021, 03:04 PM   #13
Wrenchbender Ret
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Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,204
Re: Using the vacuum gauge

Check all the vacuum units hooked to the vacuum outlet on the intake manifold in back of the carb. for leaks. Like the power brake unit or the trans modulator or A/C, heater controls. A leak in that area can affect 2 cyls. & cause that. Try pulling a plug wire one at a time with the engine idleing to compare the amount of effect it has on each cyl. That can pinpoint you to the cyl. causing the problem.
George
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