Welcome to jeepz.com
forgot the designation of that carburetor , old age , please forgive me. But I believe it's a carter ? Possibly the BBD model ?
It's Definatlt a feedback carb . Did you obtain the I.d. Numbers from the original carb when you ordered it ? Guessing it's already handed in for a core . The correct carb for your year should be a feedback carb with the mixture control . A stepper motor to me is a motor to advance idle when a/c is on and is ECM controlled . But at least if the idle mixture screws are set correct , you should see fuel squirt from the clusters below the choke plate as long as the fuel,pump is filling the float bowl . Check to see if fuel squirts when the accelerator linkage is moved to verify .
Somewhere , either the Internet from a carb rebuilder site or a good repair manual carb rebuild section , the carb numbers are obtainable for that engine , that model year . Some manuals won't include them as that is usually left to data sheets on rebuild kits but older manuals did have them . a factory service manual may not have them . They're usually found in older repair manuals . Ever since later models have evolved with fuel,injection , that info has fallen to the wayside .
the older MOTORS manuals which are more professional did include them .
Hope this post helps but look for the fuel squirt to see if carb is functioning as should .
Also , check that the idle mixture screws are open . Couldn't say how many turns are factory preset but that's adjusted after the engine running with a vacuum gauge and / or tach , which ever best suits your expertise . At least they should be evenly balanced , equal turns out from seated . If you want to verify screws are open , turn each one in until,it lightly seats counting exactly how many full turns and half turns or there of . Record this for each screw and return to this setting . It may be correct but not having the data sheet specs makes it indeterminable .
fear not however , as I've said , that is only preliminary . They must be set on the engine when warm for best performance anyway. Hope this helps .
please do be careful to NOT crank down on the screws when seating them when turning in upon counting turns . That will cause damage . Use restraint .
When the screw stops turning , it's seated . Just like a hot and cold faucet , if we continue to crank them in hard , we will have to replace the washers .
If damage occurs to these screws , they are supposed to be replaced . But the damage to the carb seats is a bigger problem . Please use restraint .
