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!
An Alpha reading of 83 is the equivalent of -17% short term fuel trim. Alpha is based on 100 being equivalent to zero trim, so numbers above 100 are adding fuel, and below that are subtracting.
What trouble codes are you seeing, if any? What's the specific driveability complaint?