2000 honda accord ex idle problem?

[Alex]

hello i have a 2000 honda accord ex and for some reaso, its idling very low. at first the check engine light cacme on and when i got it check it was a p0505 error which means idle malfunction but a couple days later it went off now when i start it it will idle real low or sometimes when i start it will just shut off but if i rev it and warm it up it will start to work fine one day in the morning it started up fine but the next day it start then shut off like i said i got to rev it up to make it idle right does my iacv needs to be clean or repalce