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Sounds like the thermostat isn't shuting completly and that's not allowing the engine to reach operating temp when you're out on the road.
I had that problem with another car and took three years to find the probelm as it would always warmup just fine sitting in garage with all the testers on it, but out on the road it had problems. It was the heater running cold one below-zero night driving through Canada that gave me the final clue. Stuck some cardboard in the radiator to warm up the heater and, PRESTO, the car started running great too.
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