Sugar in the gas tank is an old trick used against enemies (for retribution) or friends (as a lousy practical joke). If that's what has been done, you'll have to have the tank drained and flushed and the rest of the fuel system flushed. Very expensive job. Good luck.
SOURCE: fuel line freezing
If you got freezing and all these problems persist. And you did all that you said you did, then I must say first of all, You got one H*** of an engine. But, No choice, You have to drain your Fuel Tank. I think you already knew that. Just hope you don't keep it topped off. Good Luck.
SOURCE: 1998 Mercury Grand Marquis Fuel Pump Replacement
you can try just resetting the fuel pump switch located in the car
the switch is originally in the car for in case of an accident, however, if changed, chances are you also have to reset it
in my 98 grand marquis, the switch is on the left side of the trunk
SOURCE: not firing right on no.4
First check plug and make sure the right plug for this vehicle,make sure that the heat rating for this plug is correct. Your problem could be a wrong heat rating plug been installed. Also make sure that the misfire is due to a bad plug and NOT a bad injector or injector wiring or uneven compression or even bad coil. Check injector wiring and make sure it not shorting or broken. To check injector pulse use a NOID light can be bought at almost any auto parts store like Auto-zone etc. Also compression can be checked with compression guage. A rule of thumb to go by is if any cylinder has more than 10 PSI in difference in compression there is a problem like a burnt valv etc. Here is a n example cyl# 1 170psi cyl#2 176 psi cyl#172psi cyl# 4 150 psi, there is a problem with cylinder # 4 and will cause a miss from cylinder #4. Good luck and thank for using FIX YA
SOURCE: My 2001 Mercury Grand Marquis LS has this jerking
You have a described one of the coils going bad. You need to ru na power balance test to determine which cylinder it is so only one is replaced.
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