Engine Shakes - What's Causing It?
Just bought a 2009 JCW from Craigslist, and I was sitting in the car during the test drive at idle and noticed vibration coming through the steering column and the seat. I ask the owner about it and she (2nd owner) had no idea. I thought, maybe it needs new plugs or something simple like that. Anyway, I bought it and I hope with y'all's expertise here that it will be a straightforward solution (as straightforward as MINIs get anyhow!). I wanted to get your opinion before I started throwing parts at it. There's oil around the valve cover, so I have new gaskets to install when I get back from SoCal on Friday.
It vibrates at idle all the time (cold or hot), and from cold start, RPM fluctuates 200-300.
What should I check for next? If vacuum leaks, where exactly?
Background: Timing chain full service was done Dec 2017, turbo replaced and walnut blasted last year as well. HPFP not yet done. Also don't know if this could cause a vacuum leak, but the AMS to turbo intake hose has a crack (more like a melted tear) on the turbo side under the hose clamp. It's over the lip on the turbo side, so should be fine?
Thanks in advance!