I'd be willing to bet it is your idle fuel cut solenoid. It is super easy to check. First unplug the carb harness and look at the end.
![](http://www.bluebassdesign.com/boonin/carb_faq/images/22r_harness.jpg)
Looks just like that. Then just make to wires to plug into the + and the - fuel cut solenoid blades, touch them to the battery you should hear a clicking. If not then your solenoid is bad, if so then check the body harness. The + should have power when the key is turned on.