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Message: <blockquote data-quote="gmt" data-source="post: 3187969" data-attributes="member: 67018">Hi skywalker , I have sent my car to many workshops already . every mechanic told me the air is not smooth the problem is in the carburetor and non of them can tune it back .As for the distributor ,Once I asked a workshop to change the whole distributor but after that the problem still exist and then they took it off and ask me to replace my carburetor but i didn't . I have changed the spark plug almost everytime when I sent the car for solving this problem. I have lost count how many I have changed, so now the spark plug in my car is still new .One strange thing about my problem is that when I changed a new battery the rpm stop going up and down or fluctuated only slightly but after afew weeks it happen again and then it goes away if I drive more often. If I plug a fm/mp3 player at the cigarette point after awhile at traffic jam the car will turn very bad , the rpm will go up and down widely and it will stall if not stepping on the oil pedal , so I suspect alternator problem and change a new one just recently but the problem still there .These 2 days when I start the car in the morning the rpm fluctuated slightly when the engine is cold but when it is hot or when the temp indicator showing 3 bars the rpm gong up and down again . The first day the car stall after the engine is hot the second day the car still running but the engine is not smooth and rpm going up and down .So which part of my car is actually the culprit ?</blockquote>