We have measured the rotational spectra of several molecular eigenstates of the cis and gauche asymmetric hydride stretch in order to determine the nature of the weak vibrational interactions observed in these vibrational bands. The rotational spectra are measured using an infrared-microwave double resonance technique based on the Autler-Townes splitting of states in a strong microwave field. From the rotational spectra, we can detect contribution to the eigenstates from both localized structures (cis and gauche) and states of delocalized structure, or "isomerization states". Evidence of rotational transitions assigned to isomerization states are observed in from the eigenstates prepared in both the cis and gauche vibrational band. Furthermore, detection of Coriolis interactions in the cis band is observed. However, we do not detect any coupling between states localized around different wells of the potential (i.e., cis and gauche) suggesting that the molecule is not undergoing isomerization.