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Just checked it again and with the ignition on it sits at 46 psi and loses pressure very slowly. With it running it bounces between 40 and 42 psi. I didn't replace the fuel pressure regulator and will this week.

I have a 2003 Tahoe 5.3 that starts and idles fine but after I drive it for a little bit it becomes sluggish when I give it gas and if I floor it the truck will shift down but won't accelerate then it stumbles and stalls. It will start right back up once I turn the ignition off and run fine for...