Hi- new member just back in the old diesel game with my 1984 300d. I was experiencing a random engine shutoff problem (engine would just stop while I was driving) which I initially thought may be related to the ignition switch assembly and the attached vacuum line for engine shutoff through key use. Previously I had noticed a slight engine stumble when pressing different buttons on my climate control panel, but not severe enough to shut engine off. Yesterday I was able to stop the engine 3 times in succession simply by pressing the farthest right button on the climate control panel (the one with the circle, which shuts climate operation off if I understand correctly). With that button still pressed down, the engine would start, but only run for a few seconds until stopping again. As soon as I pressed a different climate control panel button, I could restart and continue driving without problem. Problem seems intermittent, as in the past I can usually change climate control settings as often as I like, but then when I have stalling issues it happens multiple times in succession before going away. Any ideas? Thank You!