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random multiple misfire

  1. 99 Misfire

    5.9L V8 Specific Topics
    About a week ago I started my truck up and it started misfiring; previous day ran fine. Codes P0300, P0306, and P0308. Changed the cap, rotor, plugs, wires, and coil. There are no vacuum leaks and the plenum is sealed with no oil in the intake. The misfire is most apparent at 40-55 MPH when it...
  2. Random Multiple Cylinder Misfire p0300

    5.7L (345 cu in) HEMI V8 Specific Topics
    I have a 2011 Ram 1500 with the 5.7 hemi. A couple weeks ago it started to misfire and threw the code p0300 and p0303. The weird thing is that if you switch from off to run a couple times the engine runs fine. Any ideas?
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