You said when you read the codes there was a misfire loggedUpdate - fitted a new fan and actually used the car today after doing some other gubbins.
All seemed well until car lost power.
Fan working, coolant level good, heater pumping. So in my mind thermostat is working and coolant is circulating.
Car smelt like it was overheating…
Why power loss?
Fan will no fix this
Is the misfire still being logged
The loss of power, once it's happening iis it permanent, f you switch the engine off and back on is it normal, if you let it cool down does it go back to full power