380SL shaking & vibrating on idle

[cmd85]

Just became the new owner of an '85 380SL (144K) - Seems to be in decent condition, except every once in a while it shakes & vibrates when idling. Other than that it runs nicely. Today it stalled at a red light. Hmmmm. Any thoughts on that? Hoping to take it in next week to a Mercedes mechanic who specializes in restoration MBs. Just thought I'd try this forum first to see if anyone has ever had that issue who may be able to shed some light. Thanks in advance for any info.

Chris

'85 Mercedes 380 SL