Engine light went on. Car runs, but with less power and smells from rear end. After computerized diagnostic mechanic said that code indicates misfire and car's engine needs tune up. He did not give itemized estimation of the work to be done, but it may go up to $250.

Right now engine light is off, maybe because car was not in use for two days. And I am not sure if I should take car back to fix things. I do not know what really shoud be done in my case, because I already have experienced (two years ago), when at repair shop they replaced a lot of things that should not be replaced (and did not help fix the problem) because they did not know what the problem was.