I don't know when the last time the spark plugs have been changed in my 2010 SXT, if ever so I'm thinking it might be time but I had a couple questions first. What are some of the symptoms of spark plugs going bad specifically in the Avengers? My red lightning bolt light (ETC I believe) comes on occasionaly now even after a good seafoam cleaning. Would new one's help that out at all? I hate this engine limp mode crap.. And I've looked around on the site and have seen that the dealer is the best place to buy plugs. Is this true? What kind do you guys have and what are the best?