Hi all, new member with a question. My 04 Durango with a 5.7 Hemi has a p0300 code now. It runs good going down the road then will suddenly start to misfire, almost stall and the check engine light flashes and an alarm bell starts ringing. I slow down to pull over and then it clears and runs again like nothing happened. This has happened several times and I changed the plugs, wires and one coil and it did the same thing and now have a P0133 code for the O2 sensor. The Durango has 126203 miles on it with no real problems before this.Where do I go from here?