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Staritng Issue
A tune up is good but I suspect (can't prove) that you are losing fuel pressure at shutdown. Perhaps the fuel pressure regulator is weak or the fuel pump chekcvalve(if it has one) is faulty. I would guess at shutdown enough fuel remains in the system to start her up but then the fuel pump has to play catch up and keep the injectors filled and redy to squirt. I am not familiar with the fuel pump system on the Mercury's (does the fuel pump have to come up to speed at key to start position or is fuel always available in the rail). Try turnng key to on but not start and waiting 15-30 seconds before you try to start the car and see if that makes any difference.
I had a 1988 BMW 750 and she had similar problem and a mod was available to add a check valve in the fuel line just forward of the pump (in tank pump) so that fuel could not drain back to the tank at shutdown and this worked.
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