urgent engine help

i have a 302 i just installed with a 600cfm holley 80457-3 and im having so much trouble because it wont get low enough idle and when it does it wants to do so im stuck and i need to get this car running right. could i have some help
if you can turn up the idle high and keep it alive in drive it runs good accept its idling so high

 

what is the idle at in means of rpm?

i couldnt get the holley i had to idle right either and chased the settings all over the place and just gave up got an edlebrock and never had an issue. but if i was you id get an holley tuning book ive heard its a must need with holleys

 

well i just dont know where to start

 

Is it a new carb or rebuilt? Disconnect the throttle linkage and let it and carb relax then see if it lines up with out moving carb linkage. Did you make sure that all surfaces were clean and gaskets set properly when you bolted it on? If not you may have a vacumn leak which will cause it to idle fast. If it is new before you go to far run the fuel air mixture screws all the way in then back them out approx 1 1/2 to 1 3/4 turns this should put them at a general setting to run while you fine tune the carb. If it is a rebuilt get a can of carb cleaner and with car running sray the carb around the base and the throttle rod bores in the base of the carb. If it flutters, stalls or races higer than you will have to start looking for vacumn leak. Rebuilt carbs aren't always rebuilt completely and have some serious problems such as egg shaped bores, warped base plates etc. Good luck.

 

Its rebuilt. It lines up and we rebuilt it very slowly and right and also it does not flutter when carb cleaner is sprayed at it it does nothing ugh

 

so what do i do now

 

Are all the vaccume ports connected and or capped off?

 

yes they are all connected and capped off

 

MAke sure the secondary stop isnt too high. Holleys have a bad habit of drawing air and fuel out of the secondaries at idle. Try and close the secondary blades with it idling. On the drivers side grab the secondary shaft and try to close it. It will flex and close a bit. See if your idle drops. If its open too far you will even see fuel dribbling in the secondaries. Its really common and used to make me some easy money.

 

check your timing

 

we think the timing is right and the vacuum secondaries are not leaking

 

Disconnect your throttle cable, and see where it runs. If it's still revving high, it's the way the carb is set, or your timing could be advanced.

 

Do as Dave stated...If its still idling too high with the throttle closed and the idle screw set properly (try backing it off) your problem is either the mixture screws are turned out way to far or the timing is severely advanced.(provided you are absolutely sure you have no vacuum leaks) If either is the case...Adjust the timing so its correct. You said you "think" the timeing is correct. Be certain it is.With the engine off, now turn the mixture screws in till they stop (dont force em shut) Back em off 1 and 1/2 turn each (you have 2 of em) one on each side of the primary (front metering block/float bowl) and see what you get.Good luck!!!

 

If you cover the secondaries with your hand while the engine's running and the rpm drops you've found the problem. But, always set ignition timing before setting the carb.

 

What was the condition before the rebuild? How old is the carb and has it backfired? Newer carbs hack a built in protection for the powervalve but older one do not. If it backfired and it's an older carb you could have popped the powervalve. That will let it pull too much fuel and it won't idle worth beans.

If it's just a daily driver I would pitch the Holley and get an Edelbrock, much more user-friendly and drivability is better. Also double check your float level.