while idleing the vehicle sounds like it misses on 1991 Nissan Pathfinder

the vehicle is a 1988 nissan pathfinder and while we are sitting idling the vehicle sounds like it misses. we place it in neutral and acceralte a little to overcome the missing. Someone mentioned maybe a timing gear!

Asked by for the 1991 Nissan Pathfinder
With that VG30 engine it could be a bad spark plug or plug wire but another possible "noise" could be the exhaust manifold has a crack or manifold stud to have pulled out of the head (common).
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Vacuum leaks tend to misfire @ idle but will disappear off idle as more air is required