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Q: My 2008 Mazda 3 (2.0) engine is running loud and very rough. on 2008 Mazda Mazda3

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I know it needs new spark plugs and replace air filter but doubt they are the problem. The check engine light is NOT coming on. I have heard about engine mount problems with Mazda 3. Is this a possability? How about needing a valve adjustment? The vibrations get very bad at 50 mph and above.
the loud is most likely an exhaust leak. that leak will cause other drivability issues. fix that first then go after the rough running. it may be a motor mount but you would complain about other issues if that was the case.
if you know it needs plugs why have you not changed them??

I think your answer is right on. This morning I got a friend who works at a local repair facililty in Annapolis to listen to the engine and the first thing he said was have them put it on a rack check the exhaust. He also said to not have anyone touch the valves. Not causing the problem I am discussing. Will be at the local muffler shop on Friday. Having a 90,000 mile go over on Monday and that will include new sparks, filters etc..

Thank you much!
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