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Recent content by MosbyMPI

  1. M

    4.3 MPI poor performance WOT

    The one I took out certainly looked long overdue. It was marked a marine cap but had aluminum contacts so the corrosion was fairly significant.
  2. M

    4.3 MPI poor performance WOT

    Distributor cap and rotor was corroded. The cap appeared to be original but it had aluminum not brass contacts. Also swapped out the plugs, again they appeared original. Finally put in 15 gallons of fresh marine fuel. Now runs with no issues 😀. I used a premium cap and rotor with brass...
  3. M

    4.3 MPI poor performance WOT

  4. M

    4.3 MPI poor performance WOT

    I just had it out, once it cools I will pull a couple plugs again to see how they look. A couple weeks ago they were reasonable beige ish not really wet or anything but you could tell by overall they are likely original. Yes cap is also a suspicion. I haven't pulled the cap to look yet because...
  5. M

    4.3 MPI poor performance WOT

    Definitely that will be my next step after mostly new fuel. I think the fuel pressure regulator is in the fuel cooler on this one as the fuel return off the rail is capped off from factory. Ya I guess I shouldnt curb my frustration with seafoam 😉
  6. M

    4.3 MPI poor performance WOT

    Good morning I have a new to me 2008 Glastron with a 4.3 MPI. Had 334 hours when I got it now I am at about 339 hours. Issue has been when it's cold it misfires under load and once warmed up at wide open throttle. Once warm it just doesn't seem to pull as well as it should getting up on plane. I...
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