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First, it wouldn't be a bad idea to change the coolant. It's supposed to be changed every 5 years, but there's no guarantee the prior owner did that.

I'm wondering if the thermostat isn't opening up all the way - opening just enough to heat the radiator inlet (so no codes are set) but not enough flow to cool the engine. The fact it comes down when you turn on the heater makes me think the heat just isn't getting to the radiator.

As for the stumbling - let's see what that tank of gas does.
 
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