OK, so if the vacuum is not at 0 with the engine running or the ignition in the start position and if the vacuum doesn't rise to turn the engine off then what are the possibilities? Is it that either the ignition switch is bad or there is a leak between the switch and the shut off valve?

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r2

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'84 300SD 205k miles-sold
'84 300TDT 270k miles-sold
'80 300CD 200k miles-sold