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    po300b 2002 denali

    hi ; i am having issues with my 02 denali. i have a po300b code. i changed plugs . when doing that i found all plugs to be clean and gray/tan. ( may be lean) i then cleaned the injectors. after a test ride the code came back. tested fuel pressure and found 45 psi at idle, 55psi with vacume...

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