Ok, so I get it al nice and running smoothly, so reconnect the coolant sensor and put everything back together. Start the car up and the idle bouncing is back again, only this time when it goes low the car almost cuts out!!!

So I have to readjust the idle/CO2 to make sure it doesnt cut out.
I think im going to have to check over the timing and dizzy advance first, would this cause these problems if they weren't correct?