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Looking for some help with my sons 2015 Jetta SE. He's been experiencing rough idle. He has 80,000 miles. I did the easy thing and put in some plugs (actually it wasn't that easy!). It still idles rough, but drives good. I ran a scan with VCDS, and he has misfire codes on ALL cylinders. Before I spend his money on coil packs, could it be something else if all 4 cylinders are misfiring? Thanks!
 

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Could be your PCV valve threw in the towel. Rough idle is usually pcv related, common issue.

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