{Chrysler 300} Rear Plugs Fouling

[Anthony Doughty <62red300h@xxxxxxxxx>]

After about 1000-1500 miles the rear plugs on both side of the 413 in my 300H start to carbon up and fire poorly. The other six plugs are fine.  The carbs have been overhauled, idle settings are shop manual correct, and the car runs really well until the carbon begins to interfere. Anyone have any thoughts or knowledge as to:

(a) why this might be happening and 

(b) how to fix it?

Thanks for any help and advice,

Tony Doughty

  

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