Engine Hesitation after quick stop

[91parkboi]

I have a 91 Buick Park Avenue with 140,000 miles on it. I recently had the Mass Air Flow Sensor changed because it went out. Before I had it done, before coming to a complete stop, the rpm would jump a little bit then fall below 1000rpm. After I got the sensor replaced it hasen't done it in a while but the other day I felt the hesisation in the engine after coming to a quick complete stop. Is the MAF sensor no good or is it another problem???

[HotZ28]

Sorry, but this could be any number of problems, the MAF, EGR, IAC, TPS, PCV, vacuum leaks, fuel pressure, or clogged fuel filter, just to name a few. You need to see if you have any stored DTC's first. Are you familiar with how to retrieve codes, using the "paper clip" method?

[91parkboi]

No I am not, can you inform me?

[HotZ28]

Locate the ALDL (Assembly Line Diagnostic Lead). It is located under the driver's side dash. Insert paper clip between terminals A & B as shown below.

Turn key on, but do not start engine. The check engine light will begin to flash. The ECM (computer) will display a "code 12" by flashing the "service engine soon" light, indicating that the system is operating. A code 12 is simply one flash, followed by a brief pause, then two flashes in quick succession. This code will be flashed 3-times. If no other codes are stored, code 12 will flash until the diagnostic terminal ground is removed. After code 12 has flashed 3-times, the ECM will display any stored trouble codes. Each code will be flashed 3-times, then code 12 will be flashed again, indicating that the display of any stored trouble codes has been completed.