We report line shapes for several rotational levels of the 9s, v = 1 state of NO, lying just above the autoionization threshold, and the 8s state, just below threshold. The 8s levels exhibit unexpectedly large Stark shifts, giving way at higher fields to multiline Stark spectra, and eventually to Lorentzian autoionizing resonances. The large low-field shifts are tentatively attributed to an unusual "field-induced deperturbation" process. At zero field, the 8s states have lifetimes of at least 20 ns, indicating that predissociation does not play a major role for these states.