[what can cause idle fluctuations?]

-20 psi vacuum is the standard for a "WARM" idle on most turbo cars, well all that i have had, and usually if the cars not running right, and it doesnt have -20 i find there is a vacuum leak. hope this helps.

[Sloppy / Floppy shifters - DIY Guide inc'd]

dont no if this helps but my experience with sloppy gear stick is from both the missing spring and missing sleeve on the bolt inside gearbox

[what can cause idle fluctuations?]

20vac is good for most cars, quick easy way to check for vac leaks is to see if 20vac on the gauge at idle