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If I had to take a shot, maybe your engine has a knock sensor and its retarding the ignition due to increased engine temperatures. Once it gets too hot you'll get pinging which the knock sensor will sense and thus retard timing to avoid engine damage. I don't know if your engine has this. I guess its possibly built in to the coolant temp sensor's programming too. Theres really no way to tell for sure what your coolant temp is without some sort of gauge. I think we all know that the hot/cold gauge on your dash isn't remotely accurate.
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