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if only doing while going up hill ( motor underload *) then is mostly likely "premature spark knock" caused commonly by the engine timing being " fast " basicaly the sparkplug fires before the piston reaches top of its cycle. though it is not uncommon especially in high-compression engines to be a direct result of low-octane fuel. Try running a higher grade of fuel. if that don't stop it then take a look at engine timing

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Q: Why do your valves clack when going uphill?
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