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Message: [QUOTE="2strokerfun, post: 1402594, member: 69719"] The "clacking" is a fairly good description of what detonation sounds like. And running lean can cause this when engine is under a load. As others have said, dump all your 87 fuel and get the best premium you can locally find. Try to avoid ethanol in your gas if possible and get real gas (if you can find it). Then see what it does and report back. Don't try to save 30 cents a gallon by using 87 if something better is available. [/QUOTE]