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Car wrench help: rough idle (Humble)

GM 3800ver3 block, 4 years ago had this exact issue either running rough or no start. Local shop charged us fortune to replace Crank Sensor and Ignition Module.
Flash forward to last week starting doing it again. Swapped module. Nothing.
Yesterday after extensive peeking, have a theoretical culprit, want to know if fix it gurus has encountered this/if this cause is plausible: top and side gaskets seals all old worn breached, oils fluids dripping out side, trickling downward to bottom of block and shorting out crank sensor

post id: 7754735569

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