I have an 84 mercury grand marquis mileage approx 350,000 miles.. ran fine when i first got but due to trans problems it had to set for 2 years. and when i fired it up after 2 years it ran fine for about a week.. then started to idle rough. but when i gave it gas it ran fine.. one day it decided to stall and didnt want to start so.. i changed the distributor cap, wires, plugs, air filter, and voltage regulator. and it still does the same thing.. i tried to change the fuel filter but i cant seem to find it.. anyone know where it might be?