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Get a test LED hooked up to the wiring and see what it does. If there's a crackle in one of the connectors or wiring; it could be fooling the computer into thinking it's seeing hundreds (or thousands) for a certain duration. I had a similar problem with my ignition coil - it would stumble driving around, and I noticed my tach jumping to high rpms randomly. I figured I'd test the wiring - did the trick!