Question on speed sensor & standard transmission

I'm not sure as well, but I can tell you what I'm experiencing with my car. 5.7, Dakota ax15, no speed sensor, modified factory harness, hotwire PCM, bypassed clutch switch. When I shove in the clutch coming to a stop, the car will stall unless I blip the throttle, runs great otherwise. May be no clutch or speed signal, could be neither. I've just been driving it all summer that way, but over the winter I may add one or both to see if the problem goes away. I had a similar issue with my magnum swap car, and adding the speed sensor cured it.