fuel pressure

A few weeks ago my 2013 Hyundai Genesis 5.0 R-Spec with 108k miles started playing up. For the last 8 months I have only been doing infrequent short trips in it due to now working from home. A few weeks ago I drove it 3 miles to the grocers and then the engine started to run bad as I pulled in...

So I've made the decision 2 purchase a nitrous kit. does anyone know what the fuel pressure supposed to read? So much information on the coupe's but not so much on the sedans. I'll be sure to post pics update my progress and let y'all know what the performance gains are as well as any...