Thread: Spark plugs H9DC vs HR9DC (pictures attached)
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Old 06-02-2013, 09:06 PM
DRACO A5OG's Avatar
DRACO A5OG DRACO A5OG is offline
Old Pelican 911 Dude
  
Join Date: Apr 2013
Location: Rancho Palos Verds
Posts: 23
I would put it back to see if it will smooth it out, then check for an inadvertent vacuum leak
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