Have a 1990 GMC 2500. Started running rough and stalling out, eventually wouldn't start. Had plugs wires coil and a module by distributer replaced and now it's running. Won't move and was told transmission is gone. However when it started acting up it wouldn't up shift out of first gear. Any chance a sensor tripped when it wasn't firing right to shut down the transmission and it's still stuck in that mode. Just seems too random that all of a sudden when I started having firing issues that the transmission just happens to up and go at the same time.