need help on starting/idle problem

i have an 85 gti and every time i start it up it will not idle... i can press the trottle all the way but rpm's stay at 2-300 for about 10-20 seconds...then it suddenly kicks in and from there on the idle is fine and it runs great...until the next stop...i turn it off and when i restart i have the same problem...hot or cold makes no difference...in the morning the cold start will cover up this problem a little but after 3-5 minutes when the cold start valve deactivates the rpm's drop in the same way and i have to wait another 10-20 seconds until it idles fine...it drives me nuts :banghead: that i can not figuer out what is wrong...what part it responsible for the first seconds after start up???...any ideas suggestions or did you have the same problem...thank you very much for your help!!!

check to see if the boot coming off of the air box has a slight tear in it. i had the same year car in the day and that happened and had the same symptoms.