I have a 1993 300 SL 5 speed stick with about 54,000 miles and drive it
about 3500 miles a year.  About two weeks ago I drove it after about 2
months in the garage.  It was very hard to start and keep running.  With the
idle about 700 rpm when the accelerator was pushed down the engine would
stall.  So I kept the rpm at 1500-2000 when stopped.  The engine did not
want to go over 4000 rpm.  After about 10 miles it seemed to run normally
and would go up to nearly 7000 rpm. I went to see my mother who lives about
35 miles away.  Coming back it started and ran normally.  The next day it
started and ran normally.  It then sat in the garage again for two weeks.
Saturday it was difficult to start and would stall.  I came back and turned
around in my neighbor's driveway when it stalled across the street.  I had
to crank the engine for about 20 minutes before it would start.  Sometimes
it seems like it would fire on some cylinders but not all, other times not
firing at all.  Since the car runs fine after about 10 minutes/miles I
thought it might be some kind of sensor or brain problems at initial
startup.  Someone else says some type of fuel delivery problems keep fuel
from the engine and that is causing the starting problems.  I would like to
take the car to my mechanic on Friday or Monday with some idea of what might
be causing the problem since by the time I get there [25 miles] it will
probably be running nearly perfectly again.