Intermittent Test
WARNING: This page is about a different car, the 1995 Oldsmobile Ninety-Eight and 1995 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect PCM Blue connector and install a DVOM to monitor voltage between PCM harness boost control driver circuit terminal and ground. With ignition on, observe voltage while moving related connectors and wiring harness. If failure is induced, voltage reading will change.