I have a 1991 240 and while running, every now and then the engine light will come on and feel like it wants to stall..give a little gas and she hangs on...you can hear the engine sound surge like higher idle, then lower idle sound, back and forth, very evenly, higher lower, higher lower. Put in an idle control thing in but no, still doing same thing. Thought it could be air mass..oxygen sensor. Mechanic can't find problem unless it happens when they are with car. What's your idea? thanks for your help..any brand better if i have to get oxygen sensor. also is air mass meter the same thing?? thanks, lynn
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