yes
you dont without a tuner
It is controlled by the ECU, which you cannot remove.
The 2006 GMC Sierra-1500 has a V6 engine.
The 2011 GMC Sierra-1500 has a 4-speed automatic.
The 2003 GMC Sierra-1500 has a 5-speed manual.
The 2007 GMC Sierra-1500 has a 4-speed automatic.
The 2012 GMC Sierra-1500 has a 4-speed automatic.
The 2006 GMC Sierra-1500 has a 5-speed manual.
The 2004 GMC Sierra-1500 has a 5-speed manual.
The 2008 GMC Sierra-1500 has a 4-speed automatic.
The 2001 GMC Sierra-1500 has a 5-speed manual.