98 LeSabre hesitation

Ok. So right after 1st start up after my Le Sabre has been sitting for a while, everytime I make a tight left turn, there's a lot of hesitation. Other than that, its running great!
I usually turn left off of my street & it leads up a slight hill. I'm thinking I needs to do a tune up or maybe a plugged fuel injector?
Any ideas?

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 99-06-04-045
Date: October, 1999
TECHNICAL
Subject:
Low Power/Stumble When Accelerating in Turns or Straight Line
(Reprogram PCM)
Models:
1998-99 Buick Park Avenue, LeSabre
1998-99 Oldsmobile Eighty-Eight
1998-99 Pontiac Bonneville
Condition
Some customers may comment on low power or stumble when accelerating in turns or straight line. Other concerns may include a 2-1 transmission slip, an SES light for P0405/P1374 and an L1 coast-up IAC interaction.

Correction

The following service calibrations have been released to update the vehicles to correct the conditions.
Parts Information
The calibrations listed are electronic calibrations and are NOT available from GMSPO. Calibrations will be available from Techline starting June 1999, on the TIS 2000 Disc 12 CD ROM.