FWIW, a 560 running correctly will have a pretty smooth (though not quite watch-like) idle, will not stumble or snort under any condition, and will start immediately every time. (OK, it might have to crank a second or so once in a great while.) Anything else means there's an Opportunity For Improvement.

__________________
Craig Bethune

'97 SL500, 40th anniversary edition

'04 Olds Bravada (SWMBO's)
'06 Lexus ES330
'89 560SL (sold)


SL--Anything else is just a Mercedes.
(Kudos to whoever said it first)