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Re: Spark plug diagnosis
That says a bunch.
You know it will idle in gear at 600 rpm.
Showing any vacuum On that port says you’re idleing on the power circuit. Need to fix that.
Leave your vac gauge hooked to the ported port, hook up your vac advance to the manifold vacuum port ( blue cap just left of drivers side mix screw), start your motor, warm it up and turn the idle back down to 700. Put it in gear and tell us what your vacuum reading is.
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