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Ok I swapped teh plugs out like 15,000 miles ago. In doning so I never realized that I put the wrong length plugs in. (Ex.... ) The car ran fine just felt alittle less responsive. Now that I put NGK TR55 that are the right length in it pings when I get on it from 3500-5000. I forgot to say that I did an idle relearn right after the plugs. Do you think another idle relearn w/ help straighten this back out???? :confused: