A lot of us here do our own tune-ups, just like a lot of you do. It's a great way to save a few bucks, and frankly, we think something like changing spark plugs is one of those car maintenance skills ...

DEAR CAR TALK: I like to do my own car maintenance. I recently bought a set of NGK spark plugs online at a really good price. Then I had a thought - maybe they were stolen or fake. I did some research ...