Section 369 (Engine Controls - Trouble Shooting - No Codes - 3.4L): INTERMITTENTS: Notes
WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. Go to COMPUTER RELEARN PROCEDURES - GENERAL MOTORS
article in GENERAL INFORMATION before disconnecting battery.