1995 Oldsmobile Achiva

I have a 1995 Oldsmobile achiva 6 cylinder 3.1. When it is cold I have to turn the key to the on position for a few seconds and then start it otherwise it will stall. Also While it is cold it hesitates while driving especially when I am stopped and start to go. The service engine soon light is lit while cold but once warmed up it goes off. I have been unable to get codes because apparently the 94 and 95 GM models came with several differant computer systems in them so the normal readers won't work. Also the "paper clip" test won't work because although it is a ODB I system with the ODB I interface it does not have a B terminal. I confirmed this by looking in the Haynes book for this vehicle. Can you give me an idea of what might be wrong as well as, if possible, how to get the codes without spending $200 on a universal reader? Thanks