88 topaz(tempo)

I just bought this car for a winter beater but the engine never seems to heat up and when it does after like an hour the check engine light comes on and it will stall if i slow down to much. also wont pick up
speed after this happens... what could be the problem? and how much may it cost to fix it?
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Maybe the thermostat is stuck open and or the water temperature sensor could bad.
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