i have a 300d w115. im pretty sure that the engine cut off is vacuum (thought the tranny is not vacuum), a lot of things are similar between the 115 and 123

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76 300D 108,110 miles
99 Saturn sl1 80,000 miles - moms
91 Grand Marquis 45,000 miles - Grandparents
97 Ford F150 - 16,000 miles - Grandparents
73 Ford Monarch (parked 65,000 miles - Grandparents