Start by changing spark plugs,air filter, fuel filter,even oil and oil filter as the engine smells how clean the oil is with oxygen sensor for starters.Check electrical connections and hoses for tightness,if its not running well run a big dose of fuel cleaner through the petrol tank and give it a good run,check ignition timing(if you can)otherwise if its running poorly,get a mechanic to attend to it to diagnose it properly and easily
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