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I've been to my tuner 3 times for a nitrous tune and every time my system is lean as hell can't even get a half of pull in to do anything. I have a nitrous outlet nitrous kit along with a c5 fuel cell for my c6. I'm running the cell on low psi I have a 78 fuel jet in it on 10 psi for a 225 shot and it's just crasy lean
Are you sure the fuel solenoid is working or even the pump on the fuel cell. As long as both of those are working. Short of having a bad ground/connection or crap in the lines. Im not sure what else it could be.
What all have you tried so far to solve the problem? That will help eliminate a few things or give you some ideas to try. I would start small on the shot size assuming you are using a nozzle or a plate. Trying a 225shot without having the system ironed out could end badly.