Plz help plz lower left arm control gone and lower right side missing bolt just got it for my daughter yesterday for 16 birthday I put 150 for muffler and then 170 for tired paid 1000 and they said that was it well just found out this HELP a mom and 16 yr girl plz

76,000 miles 2001 Elantra

Put alternative fully charged battery in an it starts fine, what things could cause this?

I have to turn the mirror up and down to look behind me when I drive.

no power going to the power position sensor

I changed the fuel filter what it could be?

The car is making a load fan noise and has not stop being load at all and the car wants to skip when I drive when I am at the red light.