It should hold pressure longer, I’d change out the fuel pump. Next time the tank is down almost empty.

 

A decrease of 5 psi in one minute is acceptable More indicates leaking injector.

 

I left the gauge sit for 1/2 hour and it didn't drop below 52.

 

Ok, then if it dropped to 52 psi, leave the fuel pump and change the injectors. You did say you swapped injectors but the code didn’t change. So closely inspect #2 injector wiring, might be a bad ground or bent connection pin

 

Yes but a fuel pump problem shouldn't just affect one cylinder. And 58 psi should be fine for running. The drop in pressure shouldn't affect how it runs, maybe just how it starts.

 

Fuel injectors will be here later this week, gonna pull the valve cover off and check the timing chain while I'm at it. If new injectors don't help and timing chain is tight then I'm going to take to the shop down the street. Never had anything go from running so good to bad this fast 🤷

 

It's fixed now, problem was the fake AC Delco 41-103 plugs I got off eBay...I swapped the #1 and #2 plugs for the hell of it and got code p0301 instead of p0302. I replaced the plugs with some real 41-103 and it's back to purring like a kitten. You could tell the difference in the plugs electrodes right away fake junk lasted about a month.

 

Anyone know how you identify counterfeit AC Delco spark plugs?

 

From what I understand the real ones have 3 white dots on the top. My good ones have the 3 dots and if you put em next to each other the fake has different looking electrodes and the real ones have skinnier porcelain.

 

Did the boxes they were in say ACDelco 41-103?
Lots of times the fine print says something like "compatible with".
Sometimes you get returned parts, if someone attempted to gap them they probably broke the electrode whisker and returned them as defective.
Whatever Ebay has a no quarrel return policy.