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  1. C

    2009 Ram 1500 5.7 MDS - weird #5 misfire problem

    No additives, but thanks for the thought. In fact, I'm always been pretty particular about using BP/Amoco fuel 89 octane or above. And this has been happening for a few tanks of gas now.
  2. C

    2009 Ram 1500 5.7 MDS - weird #5 misfire problem

    Yes, all new spark plugs.
  3. C

    2009 Ram 1500 5.7 MDS - weird #5 misfire problem

    Well, I can clarify that condition 1 in my initial description only happens when MDS is not disabled, so Tow/Haul will prevent that. In condition 2, I tend to get the misfire code regardless, under higher RPMs/acceleration. If I never put my foot into it, day to day, I never get the misfire...
  4. C

    2009 Ram 1500 5.7 MDS - weird #5 misfire problem

    Good info/insight, thanks. I think I'm about at that point...
  5. C

    2009 Ram 1500 5.7 MDS - weird #5 misfire problem

    Thanks, I will try this as well.
  6. C

    2009 Ram 1500 5.7 MDS - weird #5 misfire problem

    Great idea - thanks!
  7. C

    2009 Ram 1500 5.7 MDS - weird #5 misfire problem

    I've always used synthetic 5W20 per original specs.
  8. C

    2009 Ram 1500 5.7 MDS - weird #5 misfire problem

    Thanks for the input. What puzzles me is the fact that it runs so well otherwise. Wouldn't an internal component failure like a broken valve spring, cam/lifter be constant and rather noticeable most of the time?
  9. C

    2009 Ram 1500 5.7 MDS - weird #5 misfire problem

    I have a weird thing happening at 135K miles, with a clean well-maintained, original-owner 2009 Ram 1500 Hemi MDS. It’s actually two things that are probably related: After a cold start, it runs fine. I drive about 1 minute and if/when it kicks into eco/MDS mode, it runs poorly (95% sure due...

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