Note on Intermittents
WARNING: This page is about a different car, the 1990 Buick Riviera and 1990 Buick Reatta. However, it is still accessible from the selected car via links, so may be relevant.
If an intermittent Code B334 is being set, manipulate the related wiring at ECM. With the ignition key on (engine not running), an ELECTRICAL PROBLEM warning light will indicate loss of ECM communication, and possibly help to isolate the intermittent without having to look for the code. Also check ECM and CALPAK connections.