Hyundai XG350 Questions

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My car will not pick up speed past 25mph. All this started happening right after changing to a new battery at the auto parts store. They connected my car to the digital computer and it read that nothing was wrong I don't know what seems to be the problem all I did was switch to a new battery and all of this started happening.
My brakes are not releasing when they are suppose to so its making my car brake oad had to push down. It also has a burning smell coming from the brakes.
I need to change the speed sensor in my xg350. Where is it located
if the a/c is replaced how many hoses should it have
One bolt is blocked by the engine how do I get this thing off
When turn the key to started it will make a click sound and its turning over but won't started
I have been experiencing problems with my car since the 2016 summer. When it gets to a half a tank of gas, it 1. cuts off
2. takes about 5 or so mins to start up
3. barely accelerates
4. after driving it for about 30 mins, it smells like rubber is burning.
No check engine light appears, but there is defiantly a change in the way the car drives. I only use BP and Marathon Gasoline, I consistently get my oil changes, and I just changed the pickup cord due to auto zones diagnosis. Every since then, the car has been declining in speed. I was able to fill my gas tank up to full and drive it with no problem, until it gets to a half a tank that is, now when I fill the tank, it drives crappy.
Blowers are working for a/c and heater but no heat comes out when on...
car has 125,000. This just started. Not the battery.
It sometimes stays on when the car is off and it drained my battery
1months ago
Car starts fine but check engine light comes on.
I just replaced the Valve oil seal of my XG 300 engine...but to my surprise after re- assembling the engine back and setting the timing , the engine didn't start. Please did I made any mistake somewhere? Because the engine is just rolling. What do I do?
When I drive my car it just dies and then the check engine light comes on.
Both lighters stopped working need to know where the fuse box is located at.
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