The car is a '88 420SEL. Idle, in park is dead on 500 rpm with an occasional slight rev up (lasts 1-2 seconds).

After doing a search, it seems that most cars idle at 750-800 rpm.
Is 500 too slow and if so how can I fix it?

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Thanks,
Mike

'83 300D
'87 Volvo DL Wagon
'88 420SEL (SOLD)
'98 Toyota Camry SE V6
'96 Ford Brono XLT
'94 Mercury Villager
'46 Willy's CJ2A
'40 Packard 110 4DSD

"Just another squirrel, trying to get a nut"