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My 1998 GS400 knocks momentarily at 3000 rpm under slight acceleration. No problem in hard acceleration. Premium gas is always used (various brands) and I've tried gas additive / cleaner. All recommended maintenance has been performed. Has anyone experienced this? Any suggestions or solutions (other than to always accelerate hard!!!)?

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My 1998 GS400 knocks momentarily at 3000 rpm under slight acceleration.  No problem in hard acceleration.  Premium gas is always used (various brands) and I've tried gas additive / cleaner.  All recommended maintenance has been performed.  Has anyone experienced this? Any suggestions or solutions (other than to always accelerate hard!!!)?

You probaby have carbon buildup in the cylinder and around the plugs from short commutes and city driving. Flush out the carbon using seafoam or a water flush <_<

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