My fuel pump just died this morning, so that could have been my issue with the skip shift. I'm assuming maybe the pump wasn't able to build fuel pressure quick enough for the 3-1 downshift which caused it to hesitate for a second and then it would go.

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1997 Black GTP 72k (4dr), 3.5 Pulley, Wbody Downpipe, Wbody Shift kit (street), DHP 1.0, NGK TR55ix Spark Plugs, GMP Handling kit, KYB AGX Struts, AT Italia Inox 235x50x18 Bfgoodrich KDWS, GMPP Springs, Corvette C5 Calipers, Blazertech 3200, DHP Powertuner (97-03), Built Trans, Torsen Diff