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Small black electronic sensor right on top of throttlebody. MAP sensor go off pressures and MAF sensors go by airflow. Let me see if I can get a pic of it...
x2 on the injector cleaner. most of the ones that ive seen are snake oil, so i really dont know of any company other than amsoil or BG to look into for that. other than that, i would have the fuel pump/filter checked as well