No, the last year that GM used points in their distributor was in 1972.
under the distributor cap
The ignition module is located in the distributor, under the distributor cap.
Need to know what year and what engine to help you.
And you still have a skip? Probably a bad injector.
Assuming this is the 4.3L engine, the distributor cap would be found in the back of the engine on top. All the spark plug wires lead to it.
Ignition control module.. located under the distributor The distributor cap is probably cracked and moisture is getting into it. Replace the cap .
bad seal in timer housing
It is in the very back of the engine. Just follow a plug wire from the spark plug to the distributor cap. It is hard to see. All the plug wires start at the distributor and then hook to each plug.
under the distributor cap
Depending on what type engine you have, the ignition module may be an integral part of the distributor cap.
http://www.classiccarauto.com/impala/how_to/images/distributor.png