Drop the ECM from under the dash, and whack the case w/ your hand while the engine's running. Sounds shadetree, but when they have intermittent failures due to loose solder joints this will usually trigger (or rule out) a problem there.
After that I'd go after a ground problem. I think the sensors share a common ground on the back of one of the cylinder heads, might be loose or corroded.
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1982 Z28 w/ '01 LS1 + T56, TR224 cam, Katech oil pump, JWIS chain
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