If the car is too old, you can not fix it completely. You once fix one thing,then another thing will pop out. It's just such a waste of time and energy and money and everything.Utmost, it's been tortureing you everyday. After all, you just put your a and your family's life in great peril and risk.
Please just simply get away with such a worthless car that make you visit the garage once for every two weeks.