nitrous problem

I recently put a nitrous kit on my 340. Its been working well until last week. When I acctivate the microswitch it falls on its face now. Like its out of nitrous. I checked both solenoids they seem to be working fine. Pulled the carb and hit it and the plate seem to be putting out plenty of nitrous and gas. Runs awesome on motor only. Unplugged the proggresive controller used a relay. Same thing.. The only thing i changed was the timing by 2 degrees and a fresh bottle. I'm stumped. Bottle at 950 psi