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bad timingbad sparkplugslow octane fuel*malfunctioning coolant temperature sensorblocked catalytic converter(s)malfunctioning MAP/MAF sensorsbad driving habit (driving with the parking brake engaged)having aftermarket wings on the car.tyres not inflated to the recommended pressure
faulty oxygen sensor,leaking injectors,foul spark plugs,defective catalyst,air leakages in the exhaust system,bad driving habit
spark plugs good use orignal quiltyt
