I FIXED the MISFIRE on the Dodge Ram 1500 5.7 Hemi. So my Dodge Ram 1500 5.7 Hemi I just bought had a misfire when cold and under load (above about 3k rpm) but ran fine warm. averaged about 11mpg. I replaced 16 plugs, wires and 2 bad coil packs. My mpg went from '11-12mpg' to '13-14mpg'! Misfire is gone! I bet those plugs haven't been changed for over 50k miles if not 100k. Also I cleaned up my battery terminals and sprayed my squeaky door hinges with lube.
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