not hard at all its simple
No.
could be MAF sensor or trans
Cooling fan is shot. replace the fan. it should be an easy job on any other car except the impala. unhook the electrical plug. remove the four bolts. and have a very hard time pulling it out at the right angle.
Replace the rotors. They may be warped or have hard spots that will cause this. Turning does not always help best to replace them
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it is either the key is worn out or the key cylinder in the ignition is worn out.
To know when to replace your rotors find a minimum thickness from a rotor spec sheet, take a micrometer and measure if below the min. thickness, replace with new ones. This is a fairly hard task to perform so unless you are a skilled mechanic you may want to pay to have this service done.
You have warped the brake rotors. Driving fast & hard stopping or riding the brake will cause this when the rotor is hot and you are stopped with heavy pressure on the brake pedal. Replace rotors and pads.
Brakes, If you get on brakes and get a hard vibration and shaking like the front end is going to fall off, front rotors are more than likely warped. Stock rotors are poor quality Replace with after market heavy duty rotors.
you have to take off the hubs and you need crazy hard to find tools
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Either your really hard on brakes, brakes need adjustment or your calipers are faulty.