went to use my nitrous for the first time today new setup 6psi fuel 700 psi bottle (i know low) hit it there was a sag then it picked up, brought the bottle up to 1000 psi hit it and it gos 2-3 seconds and then feels like its hitting a rev limiter at 4k?? ill shoot what is it? no fpss 57n 53f

 

I'd bet your blowing the spark out.

Try closing the gap to .030 and try it again. On my small block I have to run a MSD, a good coil and gap the plugs at .025", inorder to keep them firing.
Vinny