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Re: 2003 ranger 4.0 - 4 codes
P0300 indicates random/multiple cylinder misfire detected.
P0302 & P0306 indcate cylinder misfire in nos. 2 and 6 cylinders.
P0316 indicates misfire detected during start up - first 1000 revolutions.
NOte: All the parts you have replaced were common to the function of the engine as a whole. However, the CEL indicated only problem with cylinders 2 and 6.
So, check for ignition spark on cylinders 2 and 6 first.
Then check the fuel injectors for the same cylinders.
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