1998 Mercury Grand Marquis Questions

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I bought the car & gas gauge read "full" 320 miles til empty. Well the gallons NEVER change & the miles til empty will start at 320 but once it gets to 270 it will reset back to 320. This morning it actually said 2 ga...
how much would it coast to fix
Buy if I get it on hwy speed it seems to run ok
Noticed while driving home that my brake lights decided they didn't want to turn off. I've tried googling possible reasons but nothing seems to really lead me to an accurate answer.
I had checked it and i had#7 miss firing....now this week when I started the car....it started knocking
I changed the sway bar, ball joints what am I missing
when the car has been sitting cold, I have to pump the gas pedal several times for it to start .After it warms, it starts quickly without pumping. How do I correct this???
When I turn on my turn signals(either way), the flasher flashes irattically.Sometimes it's ok and then it will become irratic. Is this a problem with the control or the flasher?