start and stall condition showed a pass key error code on my 94 buick. lock cylinder and key ohmed out the same as new from dealership, leaving me to believe it was the anti-theft module.rather than buy one for $340, i purchased a by-pass module on line for $30.it was only for the fuel enable part of the anti-theft module. it was not the problem, but it did force me to trace the blue (normally) wire from module to pcm. a 2.89 volt reading at the pcm seems to indicate an operable anti-theft module. (again, the fuel enable meaning injector pulse).the problem turned out to be the pcm .