I think you should take it to a mechanic.
When i start my engine car there is some rattling noise that persist for about 2-5 seconds. i want to know what is the cause of this. Is it an oil pump or a timing chain or what? Help me out guys if i need to do that i will. The car is not heating up. The temperature gauge is always at the minimum.
One last thing, the idling jet problem or air flow cotroller seem to be un-effective. This is because the reffing count is not constant when the car is idling. Help me out here also, i need some advices.
Thank you i will be happy for all the information.

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