Hmm, well the car has very high mileage (the odometer is broken and was broken when I got it, but its at least 425k by now). I don't know how to adjust the valves, but other than after driving on the freeway for a long period of time then sitting at idle it doesn't seem to shake excessively. Hopefully there aren't any other problems, either way unless I find something else obviously wrong theres not much I can do beyond change the oil and put a $50 used turbo in it and hope it works. It hasn't ever been run low on oil while I had it, and I have always used good old and filters.

I still think that the air filter coming loose had something to do with it, because the turbo was fine a few months ago, then the reason I noticed the air cleaner had come loose was the turbo had started making a really bad sound and I was looking to see if I could find out what happened.