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more than likely when you replace the thermostat it will solve all your probs because the heat issue is the old thermostat is stuck partially open which allows it to get a little warm if it was stuck closed then the truck would overheat as far as the idle your there is a sensor that kicks the fast idle(used to warm engine up) down and is operated by water temp so if your thermostat doesnt work prperly then neither is the sensor
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