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Is the check engine light on? Are there any codes in the computer?
What parts have been replaced for this misfire condition?
Thank you for that information. YES, I am still here
The most common cause of this misfire condition would be bad spark plugs and or ignition coils. These fail all of the time causing the engine to misfire. If these have not been replaced as of yet, this would be your next step. You can also disable the EGR valve and drive the vehicle to see if the misfire is gone. If so, it is related to the EGR system. Another possible cause would be a bad oxygen sensor or even a programming issue with the PCM. You may want to have it checked for the latest software available
According to my specs, it should be between 34 and 45 psi
Thers is usually a fuel pressure test port on the fuel rail. If not, you would need to tap into the fuel pressure line going to the fuel rail using the correct adapaters