I have a 2001 dakota 3.9 standard.I keep either getting multiple fire code or misfire on 3.Depending on the day.The code pops up when it seems to be running fine.The most miles i can get before the check engine light is 56. When however it does act up taking off poppin back into the tb,if i turn the key off then immediatley back on it clears right up.What the hell could this be? I've changed the plugs,wires,cap ,rotor,cleaned the tb,ran seafoam through it etc.

 

Also the truck runs like a bat outta hell when cold then seems to lose power when warmed up.