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Perhaps the knock sensor is faulty - have you checked it with a multimeter? Using shielded wire? Wire continuity w/ ecu? Cleaned the threads (sensor is self-grounded to the block)? Torqued correctly?
A lot of VSS issues are actually from a bad connection - clean the connector w/ brake/carb cleaner, throw on some dielectric grease, and go from there.
If it still gives you trouble, I suggest testing a different vss, and then wiring after that.
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