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ZipZip,
You question and explaination are quite confusing.
You state that the engine will run with the 3k chip, but not with the 6k chip. This indicates a bad chip. (I have seen quite a few of these.)
But then you say "It will idle up at the rev limit and I can't get it to drop down. (SNIP)It's probably because the ignition is cutting the spark at the rev limit.
Will the engine run to 6k? Idle up to rev limit? (That is one hell of a idle.)
Can you please explain a bit further the symptoms.
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