I discovered a air line in my trunk must be 1/8 lines into a T ending to a Schrader valve figure they go to a air ride but don't know. if so what would the recommended psi or max psi be? looking it up online I only get info on any and everything that has nothing to do with my car

Depends on the system. Is it factory.

would say yes factory it was hidden under the spare tire more or less, new car, it has nothing for psi checking it with tire gage, just can't find any on it for the car at all

Sounds like an air ride system to me, but this valve doesn't seem factory to me. Lots of folks used to put the valve somewhere safe (from damage) and somewhere not too difficult to get to so they could adjust as needed. That was usually on RWD sedans and similar. I have one with a valve like you describe mounted in the trunk, sticking out of the rear bulkhead looking like a poor imitation of a wing-nut like what holds the tail-lights in, another with it mounted under the spare tire so it doesn't get hit by stuff, and another with the T/hoses/valve hanging across the top of the fuel filler. neck behind the license plate. Those are all GM B-body full-size sedans. I've seldom heard of a FWD with air ride added.

If it has factory air ride, I'd bet the pump failed and a previous owner converted it to manual air ride. If someone added air ride to it for some reason then it'* got manual air ride. If it holds air, I'd set it to 30PSI minimum and leave it there unless you find yourself wanting it to sit level after loading heavy stuff. Air shocks need usually 30PSI so that the bladders stay inflated and don't tear themselves up with every bump, and air springs need some air in them to avoid over-compression and/or pinching and/or suspension damage when they bottom out on a big bump.

If they don't hold air, you might want to look into repairing it if it'* not too late, or leave it be if it is.