I would tend to disagree it's the t-stat. Temp would rise at least a little.
If you have datalogging capability, the best way to narrow the problem is to datalog the coolant temp. If it shows it changing to normal temps (around 190-200* or so), then your gauge is likely hosed. If the temp stays at 0, then it's likely the temp sensor or wiring or connector.
If the ECU thinks your car is still 'cold', it could affect how it runs.
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Mike - 2005 V6 Automatic, 300+ RWHP; 12.79 1/4
Vortech supercharger (SOLD); 180*T-stat; PLX Wideband O2, VEI digital gauges, SOS pillar pod; JBA 9MM wires; Mac LT headers, high flow cats; 8.8 w/3.73s, LPW girdle, alum driveshaft, 3000rpm TC; Steeda UCA, panhard bar, brace; CHE lca's & reloc brackets; Steeda Sport springs, Tokico DSpecs.
 .. "Sally" is getting "balls" ...forged V8 swap in progress 
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