Hope you all can advise me and give some input. On a particularly hot afternoon, when aircon is on, my car's idle is unstable. If I press the gas and release, it will drop extremely low ~400 rpms. Sometimes it bounces back but sometimes just stays there. And I hate it because at that low speed, the engine vibrates.
Last time my other old car also got same prob. Even worse. It bounces up and down and sometimes die off...
Can please advise what problem is...
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