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It may be a combination of things. It sounds like a bad wire leading to the cluster or some sort of bad insulator. The engine will run at the appropriate temperature once its been running long enough, it can only get hotter. So unless you live in a state where you need to use heater engine blankets over night due to the coolant freezing you have nothing to worry about. As far as the engine misfiring it could be many things, from the symptoms it could possibly be a failing MAF sensor or the insulation of the wires leading to the MAF plug, usually MAF sensors once they start to intermittently fail will cause hesitation early in the RPM range. Make sure to check your spark plugs, and fuel injectors for any possible issues. Although most of those problems creep up north of 2500-3500 RPM.
Honestly I don't think it is related to the cooling system at all.
Either way though, good luck!
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