How do you replace the fuel injectors on a 2001 GMC Sonoma 4.3 liter Vortec engine?

To replace the fuel injectors on a 2001 GMC Sonoma with a 4.3-liter Vortec engine, first disconnect the battery and relieve the fuel system pressure. Remove the intake manifold to access the fuel rail, then disconnect the fuel lines and unbolt the fuel rail to remove the old injectors. Install the new injectors into the fuel rail, reassemble by bolting the fuel rail back in place, reconnect the fuel lines, and reattach the intake manifold. Finally, reconnect the battery and start the engine to check for leaks.