Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Engine mechanical conditions may prevent distributor from rotating. Inspect following if distributor rotor does not rotate: A broken distributor drive shaft, worn or broken distributor drive gear, or worn/broken camshaft timing chain and gears. An intermittent may be caused by a poor connection, rubbed-through wire insulation or a wire broken inside insulation.