poor running micra stalling on idle

my 1998 micra 1.0l has started doing this and i have no clue every few minutes it will drop out the revs and nearly stall and then the car opens the gas a little to stop it 16 secs in the vid the car is heating up fast aswell aboult half way the temp gauge and it does this within aboult 5mins and the fan does not kick in is this a bad temp sensor or something along those lines

 
I changed the temp sensor today its still running like poo and the fans not kicking in still but when I removed the old plugs it looks like the car has been running rich and I'm now wondering if something up with the lamder sensor
 
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