While these cars were never the smoothest in park, i’d imagine that with these miles, the “vibration at idle” would more than likely be the subframe bushings - they rot, and then you get some nice metal-on-metal action until you replace. Replace with the ‘06+ improved subframe bushings, and you’re good for a long,…

I bought a Saab 9-5 from Scoggin Dickey Saab in Lubbock, TX once upon a time...

Thanks to Mr. Scheuer, I get to pull out this little number: