Possibly. Maybe there's a leak between the exhaust manifold and cylinder 8. but i bet you would be able to hear it while driving. you can always check around that area for black carbon to show where exhaust is escaping.

other than that i dont know, Im not too educated on how COPS work. i guess you could switch the injector with one from another cylinder that you know works? i dont know if that works or not

 

It is a sad but true reality.... In the past a spark plug blew out of cylinder # 8. I went in with a heli coil. It held up for the longest but now it has started bypassing. I will start a new thread to seek you guys advice.
Thanks for all of your replies!