After some time looking i will try this- http://www.sterlingmetalworks.com/idle_tuning.htm
i have open the web many times, but didnīt notice that there was the Idle Tunning.
9 Easy Steps to Idle Tuning:
Step 1. Adjust the Deceleration Dashpot and the AC Idle Compensation Valve so that they are not interfering with the primary throttle operation.
Step 2. Open primary valves to use the main primary circuit to get your car running by turning the Idle Speed screw in.
Step 3. Set the Fuel Mixture screw to 2― turns out from closed. (Never bear down on this screw to tighten!)
Step 4. Set the Air Screw to 2 turns out from closed. (if you have one on your carburetor.)
Step 5. Start the engine, reduce the engine RPM using the Idle Speed screw, and let it warm up.
Step 6. Turn the Idle Speed screw in until the engine almost shuts off. (This will lower the engine RPM.)
Step 7. Turn the Idle Mixture screw in, in ž turn increments, waiting 2 seconds after each change, until the engine starts to skip. (This will raise the engine RPM.)
Step 8. Repeat steps 5 & 6 until the desired idle speed is achieved. (Usually this is between 750 & 850 RPM.)
Step 9. Back the Fuel Mixture screw out less than ž turn to ensure that the idle is not too lean. (This may require readjusting the Idle Speed screw first.)
My carb is a 1979 1980 so i have to deal with fuel and air misture screw, tanks sterling for all the details