'97 Nissan Sentra will not start up or idle without pressing gas pedal

Hi,
I just picked up a 1997 Nissan Sentra XE to repair and after running diagnostics I found out the Mass airflow sensor and distributor needed
to be changed.
Now the dianostics shows no errors, but the car still does not start up or idle without pressing the gas pedal.
What could be the issue?
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