Overheats, not hot. Cold to peg gauge in 5 min. New pump, stat, sensor. Ifr <160

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Goes from ambient (85) to peg gauge (230+) in < 5 min idling. Infrared thermometer reads under 160 on heads (header manifolds barely 210). Replaced pump, stat, hoses, belts and temp switch (85,000 mi) for small leak at pump rotor seal which precipitated overheating trouble. Engine shuts off when guage hits 235. No other apparent problems, no trouble codes logged. Runs perfect otherwise. Repeatable over and over. All stock. Private use 1 driver vehicle. Computer issue? Help appreciated.