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Re: 5.3 hesitation, stumble, lean and random misfire codes, worse when cold.
I don't know where I got 51psi from. (edited)
Copied from GM Service information:
The numbers below refer to the step numbers on the diagnostic table.
2. When the ignition switch is ON and the fuel pump is running, the fuel pressure indicated by the fuel pressure gauge should read 379-427 kPa (55-62 psi). The spring pressure inside the fuel pressure regulator controls the fuel pressure.
15. A lean condition may result from the fuel pressure being below 379 kPa (55 psi). A lean condition may cause DTC P0131, DTC P0151, DTC P0171, or DTC P0174 to set. Driveability conditions associated with lean conditions can include hard starting, hesitation, poor driveability, lack of power, surging, and misfiring.
Yours is below 55psi. I would go with a fuel pump also as j cAT recommended. Delphi
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