Performance Issue Tsb

[dmilacek]

I have a 99 Silverado 5.3 Liter 1/2 4WD. It has had a problem for quite some time where it will run poorly for a few minutes after startup, then seem alright after that. Does anyone know anything about this TSB that I found in another forum, It supposedly fixes the symptoms that I am having.

GM Bulletin No. 01-06-04-006

Date: February, 2001

Subject:

Lean Hesitation, Sag or Stumble on light/moderate Acceleration

 

Models:

1999 Chevrolet and GMC C/K Pickup Models (Silverado, Sierra)

with 4.8 L, 5.3 L or 6.0 L V8 Engines (VINS V, T, U -RPOs LR4, LM7, LQ4)

 

Condition

 

Some customers may comment on the following condition:

 

A lean hesition, sag or stumble present during light to mederate accelerations.

 

Usually only present on the first one or two accelerations.

 

The condition occures when the coolant temp is below -6 Cel and +21 Cel (20 F and 70 F)

 

Fuels with a high drivability index can also be a contributor.

 

Cause:

CALIBRATIONS NOT OPTIMIZED FOR VARIOUS OPERATING PARAMETERS.

 

Correction:

Prom reprogramming