Went for a drive this morning. After 5 minutes of driving I noticed that the temp gauge hasn't moved at all.
Pulled up at a red light and the car stalls. Managed to start to car but took some hard cranking. Once started the temp gauge jumped right up to midpoint (or normal temp).
I noticed that before stalling at the lights, I noticed the AFR were quite rich - around 12ish when usually they are 14-15 when I'm cruising.
Is this indicative of a failing thermostat and hence the car was running in cold loop?