There maybe other possibilities
Vacuum related for instance.
The biggest thing that I have seen, that sorta makes it sound like it just don't want die. Is IDLE SPEED IS TOO HIGH!
Generally you are not technically in the idle circuit anymore, you actually "on your mains" (drawing fuel from the venturi's)
Can you idle it down?
If you are sorta carb dumb, not "Only" idle adjustment is possibly the problem, it could be your Choke's high idle system, out of adjustment, sticking, binding and not allowing the throttle place to close to the "proper idle position" (which should be barely cracked open)
Do you know what to check?
Have a Dwell/ Tach meter to check idle speed?
Just ask. Even though Imma Jeep CJ kinda guy, I can possible assist you with this.
If you been-a-messin' with screws, I need to know (pics may help me know what you got)
A repair manual can/ in the future. Help you perform repair tasks.
One of these is a cool, compact, most all tuning stuff you'll need as a DIYer, it's all in one box. Less than $40 at Harbor Freight
If nothing else, send back good news!
Images (Click to make bigger)
Thursday, July 28th, 2011 AT 6:31 PM