Diagnosed rough running problem

I brought my car here after 2 other places couldn't find out what was causing my 04 Nissan sentra to run rough at idle and under acceleration also it had no check engine light on. Other garages did tune up and o2 sensors and still had the same issue. A friend siad to go here so I just pulled in a tech came out after telling him the story he popped the hood 10 minutes later he told me the mass air sensor is not working correctly which costs 168.00. He ordered the part and it came and was installed within an hour and it fixed the problem and I haven't had a problem sence and if I do I'll only be going to rainbow automotive for now on.