Can Installing The Wrong Thermostat Cause A Car To Suddenly Run Rough

I have a 1986 Chrysler LeBaron and it normally runs just great, but today I installed a 180 degree thermostat in it, as the old thermostat stopped working and the car was running too hot.

However, when I removed the old thermostat, I noted that it was a 195 degree type, and I fgured that there could be no harm in having it open at 180 in the heat of Summer, so I installed the new 180 degree unit since I had already bought it.

When I tested the car shortly afterwards after the installation of the new thermostat and fresh coolant, the car seemed to run rough for no reason other than I think it might be that the thermostat is opening too quickly.

Am I right or not? Could it be the thermostat is wrong in this case and causing the car to run rough?

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