1998 Mercury Grand Marquis Questions

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Change brain once, work a little while problem back
Oil leaking on passenger side. A/C blowing hot air.
Are they any recalls on any of these things and how to fix
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 gallons til empty & 40 miles til empty. But when it got down to 37 miles til empty it reset to 51 miles...? Fuel sensor maybe?
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 this week when I started the started knocking
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