Mercury Marquis Repair Question
well..thats sounds like either an electrical which closely related is battery power,ground,ignitions or fuel ctrl...
lets try the easy 1 ...spray starting fluid thru vacuum outlet when it won't start and crank..if the engine turn over and have combustion then chk fuel pump,vapor lock..things of that nature..
if it is power and ground then try a fresh ,test battery and new cables and terminal , it might be an ignition coil ..u gonna need a shop to test it with a scope..unless u wanna take a chance and swap it ..but If a coil is real bad when no start .. resistant test should be able to tell with a multimeter ..i'm against that as a practice of professional ..but better than nothing
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