You need to unplug the advance wire located on the firewall on the passenger side under the plastic cover. It is brown with a black tracer then set the timing to 0 (zero). Plug it back in, reset the computer and you should be done.
what are the torque specs for a head on a 2.2 liter gmc sonoma
The 4.3 liter V6 engine in a 2003 GMC Safari has a timing CHAIN
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Timing chain
In a 2004 GMC Envoy both the 4.2 liter six cylinder and the 5.3 liter V8 engines use a timing CHAIN
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The timing should be set at 0 degrees.
Look on the vehicle emissions control label it is there.
"0" or top dead center. I have a 1994 gmc picckup same thing
The computer should set the timing automatically by the sensors. If you change it, it must be done with a handheld computer.
the firing order for a 1992 gmc sierra c1500 v6 4.3 liter is 1-3-5 drive side front to rear 6-4-2 passenger side front to rear
I Don't Know Sorry