our TF 135 is playing up after a cold start (mornings) it starts perfectly then after 30 odd seconds the revs drop to arround 900 and it smells rich from the exhaust and starts to chug a bit. It drives fine but stopping at a junction and it wants to stall. Sometimes it does stall and it's quite difficult to get it to start again.
Once it's up to temperature, it is perfectly fine.
I have a T4 and nothing is coming up as being out of spec. I've readjusted the IACV, no change, new lambda, no change.