Ive had my newest zuke for about a week now...Ever since I have had it ive been trying to track down its idling problem. When i first start it, it runs at about 3000 rpms. Put it this way...i can drive clear to work without using the gas pedal...anyways, my first thought was a vacuum problem. however studying it for a while i am still stumped. it eventually warms up and then i cant keep hardly keep it running without keeping my foot in it. Any suggestions? 

Recheck the vacuum line that goes from the bottom of the air cleaner box to the top of the engine.  That one tends to pull off when you remove the air cleaner from the carb.  It has caused me repeated problems.  I finally installed a long hose with a loop so it would not pull off when I remove the air cleaner.

If you're sure that the vacuum hoses are tight and properly routed, the previous owner may have tried to adjust the idle on the carb.    It is rarely the problem, but newbies will try to adjust it, which might help compensate for the real problem.  However, when the real problem is solved, the carb idle settings are then out of adjustment and symptoms will continue.  There are separate adjustments for cold idle and hot idle.  Adjust this only as a last resort.

Idle speed adjustment (carbed models)
http://bbs.zuwharrie.com/content/topic,2270.0/all.html

Yep check for a vaccum leak.  You can adjust the hot idle also if nothing else comes of it.

what is the vehicle? year make? carb EFI? if it's carb then I'd say the choke is causing you an issue and a vacuum line. they are a pain to work with and try to get right. take some pics of all the lines and well try to find the problem one. At the same time look at all the vacuum hoses to see if there are any crack in them at all

 Also, there is a diaphram in the choke pull off that might go bad and cause a vacume leak. Use a clean peice of hose, and give it a suck, (snicker, snicker) it should pull the choke butterfly open and not leak down. HTH