this car is really crazy, sometime it want even start, other times it runs like a new one and then other times you will be driving down the road and it just dies, sometime it starts back , other times it want tell a few hours later

this is my grandparents car. it will just shut down going down the road, they let it sit awhile and it restarts. they are in their 80's and are scared to go anywhere. they cant afford another car not even a used one.