AE94 Corolla 4AGE 20V Silvertop Idling issue

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AE94 Corolla 4AGE 20V Silvertop Idling issue - what is the problem?
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check my other videos,

it was a vacuum issue, had to re-route a few vaccum lines with the help of a mechanic. it idled properly after that.

HRPMProjects
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i have the same problem with an 2008 2.5 20v jetta, and it was the "PCB valve" (something with vaccum gases system).
it cost me 10usd the replacement diafragm and spring, and literally 2 minutes of work

multimediaman
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I have the same problem. Only recently.. May I know what caused it? Mine idle lower, around 900RPM and when it do this, it will jump up and down around 400 and 1000RPM. Sometime it will dies by it self.

Ezalian