I learned today the importance of well seated harnesses and how touchy and tempermental they are so if you're having engine problems they deserve a check. After removing my compressor fan belt I must have accidentally unseated either the Thermotime Switch or the Water Temp Sensor harness because my 78 would roughly idle at around 500rpm and the smell of gas was strong. Since my arms were banging around in that area I just jiggled both harnesses and made sure they were well seated and now it runs great again. Might be time to solder in some new harnesses.