The other day I was out driving and the car just lost power. All the lights and everything are still on but when I accelerate, nothing happens. It just coasted to a stop. I let it sit for a while and turned it on and it turned right up. All the lights and everything work but it's just when driving the car doesn't respond to the gas after a minute or so. Once when I started it, it clicked but wouldn't go but then after I tried it a while later, it would start right up. It's not the alternator or starter. What else could it be?