97 Corolla (sometimes) won't start

Yes, but only one. It used to be the chief cause of that problem but hasn’t been one lately. The engine to body ground could use some cleaning on the body end. It may be a wire or a braided cable. It should be on the right front fender and it will be from there to some metal part attached to the engine. Remove the end attached to the fender and scrape the end connector. Then look where it was connected to the fender and scrape the paint off the fender where it connects. If it is attached to a stud, wire brush the stud and reattach. This will also reduce the corrosion that happens to the battery terminal if your problem was related to that ground cable.