I have seen 3 h-3's with similar problems. Get the dealer to check the connectors under the UBEC, they are a push to seat connector and have seen some not seated properly causing all kinds of wierd problems. They need to be pulled upwards and locked into place and then the UBEC can be installed carefully to seat the connectors.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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