My 03 Malibu with 3.1 engine will not start. It turns over, and has more than a few times, and the engine bumps, as if it is about to start, but will not.

Welp, finally broke down(me, not the car, ;cause it was just setting there, not doing anything), and called for the wrecker to come get it, and let my favorite mechanic wrestle with it. He got it there, climbed in, turned the key, and it started right up, and has ever since. I was kind of embarrassed, but also figured that Murphy wanted to teach me some humility. And now, all I have to do is get a new regulator for the right rear window, and I'll be just right, although that can wait until next Spring, when there will be a need to open the window once more(in lieu of the bisted regulator, I have a piece of 2x4 holding the window shut, a really old mechanic trick).