Need help with our car

Hello, I'm here to ask for help with car troubles. My father recently was in an accident that totaled his truck (our only car). He got insurance to get a new vehicle and we searched around for awhile and got a car from a lot. It seemed nice at first but after a few days we started to notice a lot of issues with the car. It overheats and shuts down at random. It is very scary to drive in. We believe it is a problem with the transmission as we have bought a new battery and fixed the brakes. We are living paycheck to paycheck right now so we have no way to take it in to get it fixed. Some days it does not start and we cant go to work. It is a huge problem that has been weighing down on us. Please help us get our car fixed and back on the right track. We would be very grateful. Thank you.

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