My wifes 91 GL with 122,000mi left her stranded yesterday 65 miles from home.
She shut it off to use the facilities and when she went to restart it would crank... but not start-up.
That got it and her a flatbed ride home and to the local dealer where, as soon as it got it's feet back on the ground it started right up. 
Naturally, the dealer says they can't fix it if there's nothing wrong with it. (they wish the damn thing would just disappear)

This is the third time we've been through this routine in about the last 5 years. 
And...I just did a complete tune-up two weeks ago. Plugs, wires, cap and rotor and air filter.
Plus I cleaned all the ground wire terminals at the block and left side bulkhead.

Anyone have any ideas?

91 Vanagon GL
84 Vanagon GL
97 Jetta
89 Jetta
74 BMW 2002tii
58 MGA

Thomas Brobst
Accu-Sort Systems, Inc
Staff Mechanical Engineer
215-721-5061
fax 215-799-1600

If we knew what it was we were doing, it would not be called research, would it? -Albert Einstein