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Hi, I have a wrx gc8 and since 6 months ago, I've been experiencing some issues. Basically, this is what happens: When I start running with the engine already warmed up, every time a hit the clutch and shift, the revs pop up to more than 1,500 rpm or even 2,000 rpm; also at idle (neutral) the rpms don't stay at 800 rpm, but they start to oscillate between 1,000 and 2,000 and it really annoys me, because at the stop light it seems like if I am revving the engine. It was difficult to troubleshoot with the mechanic, because it doesn't happen every time, it comes and goes, so the mechanic cleaned the IAC sensor, but it only solved the issue for 3 days.

I have been told that it can be caused by a vacuum leak, but if that is the case, what should I do? Buy a new vacuum kit? Or replace the bov?

I am really lost with this, and I would really appreciate some guidance.

Thank you.
 
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