I want to start An Auto Blog

Recently i'm looking for a new car to purchase and visited a lot of sites to compare cars. Then i think to start an autoblog. How's the idea. And please suggest me if this is a good idea or a bad idea......

It's like saying "I want to start a business, is it good or bad?"
really depends on multiple factors:
- Are you skilled in developing automation?
- Do you have a specific niche in mind?
- Can you drive traffic to that site?
- Have you thought about the monetization?

it would be a good starting point to make some money, but I wouldn't relay on it for the long term. I agree with TavaX, those are the crucial factors to determine if You were to build a successful auto blog. Keep in mind that an optimized aggregator site or a pro auto blog is not easy to create, but if you are feeling able than you shouldn't spend any more time and start building it at this very moment.