1999 ML 320: On March 1st I backed out of garage and started forward
and it died - tried to restart - no starter noise - nothing.  Hauled
to mechanic who put it on a lift and it came back to life (took about
5 hours from time it happened till I got it to mechanic).  On March
18th I stopped at a store, came back out, same thing - would not start
& no starter noise - left overnight - it started.  Took it to dealer,
they replaced crankshaft sensor (tested bad).  Yesterday evening I
went to start car - same thing again.  This morning it started OK
again.  Drove it to dealer this afternoon.  Dealer said they have no
idea what it is - can’t do a computer check on it unless it is
displaying the problem!  I have heard that possibly my key may be
going bad (?) - why would it be so intermittent?  One of the other
topics here mentioned that 2 of 3 bad coil packs could cause a
non-start situation.  Don’t know what those are.  Thought it might be
heat related but when it was in garage overnight and would not start -
rules that out.  Any ideas on what to check next??