Try 1-8-4-3-6-5-7-2 CLOCKWISE The firing order is above. If you need a diagram you can get one at http://www.classiccarauto.com/impala/how_to/firing_order.shtml .
You can view a diagram of the engine for a 2002 Chevrolet Impala at most Chevrolet dealerships. Many auto-parts stores will also have a diagram of the engine.
A diagram for a 2001 Chevy impala 3.4L engine & coil pack firing order
antifreeze lines
The diagram is not on a decal under the hood or in the engine compartment.
It is on the intake manifold near the thermostat.
http://www.classiccarauto.com/impala/how_to/images/distributor.png
Yes they do at the intake manifold.
It is at the engine end of the top radiator hose.
It is on the intake manifold near the thermostat housing.
It is located in the intake manifold near the thermostat housing.
back of the intake manifold ...back of the engine center top
firing order is on top of the manifold (if it is stock).