HELP: idle/ stalling problems

for some time now the motor has been having idle problem when cold but after the car warms up it's fine. well yesterday it got worse. i have to keep the eng alive by reving at lights and full throttle when on the gas. there is no check eng light and the car runs but i will prob. get arrested if i drive it like this to much
I'm thinking it may be the t.p.s. or the i.a.c. but i don't want to just swap parts with no real idea of what it is.
any body have any ideas?
i used the search but go nothing.

I'll check it out.
there is no check eng light.
i cleaned the i.a.c. really well with carb cleaner and q tips.
it helped a lot but did not completely fix the problem