I bet it's wiring somewhere. This one time when I was rewiring under the dash, I actually forgot to re-attatch a ground wire to the column, and it did the exact same thing. Check and RE check.

Best way to look I guess is a Tech-2, but those are a little hard to come by.

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GreenBastardPerformance2000 GTP Coupe (the green bastard)
XP, Pacesetters, LS1 TB & MAF,MSD System, P&P LIM, P&P GenV w/ 3.2, 3.0, 2.8, Devil'sOwn Injected 100% Methanol,PowerTuned, TripleEdge Trans w/3.29's
12.92 @ 105mph