TSB"s for po300 code for 97 olds lss

Question

P0172 code was also previously shown and the car stalled(Rich fuel Bank 1.changed MAP and MAF sensor.car seems to run fine in between these check lights maybe 100 miles or more.around -12 or -14 Long term fuel but seamily 0 short term fuel reading.

Answer 1

The famous culprit would be the fuel pressure regulator, With the vehicle at idle pull the vacuum hose to the fuel pressure regulator and check to see if fuel comes out from the vacuum port. Do this also with key on engine off and cycle the ignition switch to prime the fuel pump and watch the fuel pressure regulator.