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i have a 2006 bmw 330xi with 90,000 miles every single time i start my car, even after using it and engine is hot, it starts up then idle shoots down to 500 rpm shakes like crazy seems like its about to shut off then shoots up to 1300 rpm and then idles fine. I have an intake and no mufflers or resonator. This started happening after today i tried doing a burnout by letting of the clutch fast. ever since then this is happening. Any ideas?
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