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1997 Nissan Altima Headache

My 97 Nissan Altima GXE has started to act strange. At times it is hard to keep it running. When you start it sometimes it runs fine but after 70 -90 miles it wants to stall out and run irregular/ choppy. When I get to a light the rpms will flutter between 600 and 900 and then stall out. It will start up again but I have to work to keep it running. Other times it runs smoothly I have had it into a reputable mechanic who has done all kinds of diagnostic/ cleaned out all the carbon/ checked sensors/ Cleaned Mass airflow monitor. I am not a mechanic and seek advice. Thanks