Which engine do you have, need more info.
If this is the 4.3 engine, it is located on the bracket next to the ignition coil.
Ignition what? Switch? Coil?
HEI? inside the distributor cap
Check condition of the plugs, could also be coil pack(s) going out, if ignition looks good check compression all cylinders
Where all the wires plug into. That is the ignition coil. The ignition coil is inside the distributor behind the cap. Remove the distributor cap screws, remove the cap and you will see the coil.
The coil is on the passenger side of the engine
The ignition coil is inside the distributor behind the cap. Remove the distributor cap screws, remove the cap and you will see the coil
The wire in center of distributor cap attaches to coil.
Have you already replaced the coil?
under the distributor cap. it is black plastic and has 2 small screws in it New answer: Sorry but that year did not use an ignition module. It use a crank senser and cam senser. If this is a S10 with the 4.3 L engine, it has an ignition module and it is attached to the bracket that also holds the ignition coil on the passenger side of the engine.
Please provide more info on what you mean by 'ignition'. Reason is that there are more specific items such as ignition coil (pack), ignition switch, etc...
Lower side of engine block on passengers side, best reached from under the vehicle.