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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 makes the truck shake like mad. If I step on it a bit it gets up to speed just fine but my fuel mileage is suffering and it smells of unburnt fuel when idling. I’m a new here so any advice is good advice, please help.

1999 Ram 1500 RWD 5.9 360
 
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