Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
My 1995 buick started running bad and discovered mass air flow was bad. Didn't have money at time to replace and since it had both a map sensor and a mass air flow sensor and car run fine. Haven't got around to replacing the sensor and a few days ago car started having a hi idle. Checked and no vacuum leaks. So can this be from the mass airflow being disconnected