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Thread: 01 silverado 4.8 engine has miss

  1. #1
    Join Date
    Nov 2016
    Posts
    6

    01 silverado 4.8 engine has miss

    I just bought a nice 01` shortbed with 200k seems to run ok but has a shake in engine po300 code and po308 put new plugs and wires ,switched coil same thing pulled out pass side fuel rail and swapped and still there .Havent taken valve cover off yet no smoke no noise just seems to shake like a bad cylinder but still has power so any suggestions other than a new engine would be great havent checked fuel pressure but dont think thats it HELP

  2. #2
    Join Date
    Oct 2011
    Posts
    24
    Replace the intake manifold gaskets.

  3. #3
    Join Date
    Nov 2016
    Posts
    6
    injectors 7 and 8 were plugged

  4. #4
    Join Date
    Oct 2011
    Posts
    24
    Did you clean or replace them?

  5. #5
    Join Date
    Aug 2011
    Location
    New Port Beach, CA.
    Posts
    54
    check fuel pressure regulator first with pressure gauge.
    6.0 MAX Blown

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