Idle drops at Start-up??????

[240mph]

Ok I have a 98 kouki KA Motor/5 Speed with about 30,000 miles.At cold start-up my idle will drop as low as 300~400 and then I will have to press the gas once then it'll raise back up to normal idle I Just changed the spark plugs,wires,oil, and air filter. But it still does it. I haven't changed the fuel filter yet but I am thinkg of it.
If anyone has any suggestion on the problem please post thanks

[240mph]

I just want to add that I just changed distributor cap and rotor . problem is still their. anyone????

[papershot]

could be the coolant temp sensor.

[240mph]

coolant temp sensor??? how can that affect the idle only at start-up. im thinking it could be the fuel filter.

[Ichiyon]

I want to know this too. Thanks... so i can fix mine up asap.