00competitionGT

so my check engine light is coming on with codes 171&174 presenting. The car occasionally bogs and i know its not the spark plugs. when i researched the codes it said to lean and could be fuel injectors starving? i personally think its one of my COP's. anybody ever have this problem. if it is the COP how do i know which one bc its not to the point where it does it all the time, which is why i want to dismiss the fuel injector theory.