Hi Guru's,

My son has a 2002 SLK230 which starts fine in cold weather and in hot
weather but not in damp weather.

The way he describes the problem is: "sometimes it will start but run real
rough, you know, like the wrong cylinder is firing at the wrong time or all
the cylinders are not firing.  If I turn the key off and then restart it, it
will start and run fine."

In my humble opinion, as a mechanic back in the '50s when things were
simple, this reeks of something cracked in the ignition-related electrical
system. He has replaced the coils.

Anybody have any ideas?

Thanks in advance for any insight.

John Simpson
'90 420SEL