Engine stalling issues

[Flying Toaster]

I have a 1997 Peugeot 106 1.1 that seems to have a few problems. Sometimes when starting it in the morning, after it starts up if I blip the throttle it stalls. Start it up again and it'll cough and splutter before clearing up. Probably related is that it doesn't have completely smooth power delivery, feels like there's flat spots and no torque at low revs. It does seem to pull well in the higher revs though... Anyone have any ideas?

[Flying Toaster]

Not too long ago I replaced the head gasket along with all the filters and spark plugs and cleaned up all the valves. It's the first few seconds when it's started that's noticeable, I'd have thought really most issues would cause poor running all the time. I'm not sure...