Stalling problem Options

[Shakster007]

Hi guys
My first post and happy to be here!
My 3s-ge starts and runs fine, but it stalls every now and then. Always when it is warmed up. The revs just go right down and it either goes off or splutters a bit and recovers.
Any ideas?
Thanks.

[Shakster007]

Never happens except when the car's temperature is at normal operating. Never happens when stepping on the gas, in fact if it happens and I get to the gas in time I can rev it and it stops from stalling. I can't repeat the stall myself, it mainly happens when slowing down or coming to a stop like when I'm parking, but sometimes it doesn't happen at all.
No mods, cept a bodykit and alloys.
I recently had the following changed:

engine oil
oil filter
air filter
brakes

and just recently:

timing belt kit
fanbelt
gearbox oil

the problem was there before the service but seems to be worse now.
On an average 30 minute stop-start local drive, it stalls about 4 times. Mind you, I was driving it less till I had the timing belt changed.

Thanks