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Hypertech is a crap product anyway, shown to slow LT1 cars down.

Have you tried disconnecting the battery for awhile?

With LT1 pcms if programming is interrupted the RAM is wiped and the PCM no longer able to work with the tuner to reflash some custom tuners can remove the chips and fix this but a junkyard PCM would probably be easier. If the HyperCrap thinks it has flashed a tune it will be locked and not help with the new PCM.
 
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