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I would really want to check valve guides for excessive wear. This takes a bit of work, and the old "wiggle test" is not accurate, so it is measuring the amount of deflection the valve can move side to side in the guide. Then if possible, remove the throttle body and use a boroscope to look into the runners until you see one of the intake valves up close.
What make/model/year/engine are you looking at? I can give you better tips.
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