Thanks for the replies. We got a kick out of the finger test chide ! Actually
mosquitoes were used as test subjects
The fuel filter replacement came after the fact but did not help.
Further tests will be done to determine if it is a fuel or electric (glow plug) problem.
p.s. this same friend of mine recently had
the engine rebuilt to his low milage '94 S350D. $$$ugh. lemon city.