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  1. I was having same problem. There is a check...

    I was having same problem. There is a check valve (not sure exactly where, sorry) that was bleeding off. Once that was changed this particular problem was fixed .
  2. Replies
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    1,436

    PO300 nightmare-2003 Sonoma-4.3L

    I have a 2003 GMC Sonoma, extended cab, 4wd with the 4.3L (vin has an X for indicator of injection system). I love this truck and have spent alot of money and time trying to get rid of the PO300...
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