I have a 2006 nissan pathfinder,will not start spins over fine was told that the on 2006 Nissan Pathfinder

cat converters could cause this problem,i removed the drivers side and it tried to start,should i go ahead and remove the passenger side,please help

Asked by for the 2006 Nissan Pathfinder
Has a mechanic actually looked at this for you yet? Have you removed the plugs and checked compression and put fresh not fouled plugs back in? Guessing can get really expensive and time consuming.
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not cat, check starter
its turning over fine,just will not start,will the starter cause this concern?