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do a tune up with the original ngk plugs... theyre expensive but worth it... then check timing... after check the intake tubing... the accordion looking couplers like to crack where you cant see it so look at everything closely.. o2 sensor would be recommended.. i know this because our twin cam hatch did that when we got it... after everything mentioned above along with doing intake manifold gaskets and egr cleaning.. she purrs like a kitten and takes out other stock twin cams like it wasnt even funny
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