my car rpm drop until 500 rpm when the engin is cool and when the rpm droop it make noisy which is i really hate to hear n i have wait until it is really really hot. i have done engin tuning but it is still the same the foreman said cannot do anything it's normal. after i have done the tunning the engin taking lot of petro extra rm20 every week..do u guyz have any sugestion plz help me...
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