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I have a 2008 explorer 4.0 that runs fine when fir started but has a misfire when warmed up. The codes that are present are p0300,p0301,p0302, p303 and p0174. I have done a complete tuneup plugs,coil,wires, also map sensor egr valve, cleaned tb,new cats and o2 sensors and still the same.
 

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I have a 2008 explorer 4.0 that runs fine when fir started but has a misfire when warmed up. The codes that are present are p0300,p0301,p0302, p303 and p0174. I have done a complete tuneup plugs,coil,wires, also map sensor egr valve, cleaned tb,new cats and o2 sensors and still the same.
Tried checking the headshot a leak?
 
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