your not burning all the fuel in one or more of your cylinders. Check your spark plugs and fuel injectors.
Yes.
you would need to change the cylinder heads also.See link below
Vortec is the motors name in the blazer and it is a great motor
A Chevrolet Blazer with a 4.3 liter vortec engine will take approximately 6 quarts of oil. The recommended type of oil is 5 W 30.
With the intake runners to each cylinder.
Cylinder order is drivers side...1,3,5 and 2,4,6, on the passenger side. Double check the wiring order to make sure that it is correct.
last cylinder on the passenger side
Number one is the front cylinder on the driver side.
Apparently, there is none. They started using them in 1996.
1996-98 blazer/s10 4.3l vortec
From what I been reading there is no egr on this engine.
The ground strap on a 1997 Chevy Blazer 4.3 Vortec is located along the bottom of the engine near the frame. It ensures that electricity flows properly through the entire vehicle.