Q: Replaced many items, but the car still doesn't start

Back away from the parts cannon. Just kidding, but on a serious note that sounds like alot of unnecessary parts have been replaced. Why don’t you let a mechanic take a look at it for you? We all believe in saving money when we can and doing your own car repair is certainly a way to do that, but there comes a time when some problems are best left to the professionals. For example all of those parts you have put on, and it may just be something as simple as a wire or fuse. I’d recommend having a certifed mechanic, such as one from YourMechanic, diagnose why your car is not starting and provide you with a clear path to fixing it.