1998 Buick LeSabre Questions

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I was hit (traffic accident) in the rear side of the LeSabre.
the front left side blinker works if i do it myself. my passenger side blinker an brake light works. what could be the problem? Ive changed fuses an light bulbs.
I already replaced the intake manifold gaskets. I don't see any leaks or smoke and it runs fine. The engine sounds great, but recently was down 3 quarts of oil
It started fine but after I turned it off, it would not start again it acts like its out of gas, there is a quarter of a tank of gas in it.
At 45mph or at 3000RPMs the RPMs skyrocket and it goes out of gear or loses forward power. The fluid levels are good in the trans. What is going on?
For a few months every once in a while my cars gear shifter would be hard a bit to shift out of park.... but now a all it keeps doing is staying in park n I cant get it out of park now....
when the gauge shows 1/4 full; the Buick is actually out of gas.
When I am driving , the car is fine, but when you slow down and put on brakes to stop at an stop light it loses gas and battery goes down , to almost zero and then back to 13 or an little over. What can cause this?
Wondering if this could be the key and sensor problem. Have tried several other things and problem persists. Noticed that the ignition lock cylinder wires can break, but would it still crank and almost turn over?
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