Engine Surge on High Idle Only.

93CalypsoConvert

Active Member
Nov 26, 2020
65
25
28
41
Southern Virginia
When I start the car, it surges on high idle only. Normal idle and driving is fine. Its a 1986 with a carb set up. Any ideas why it might be surging? I checked for vacuum leaks but couldn't find any issues. I've adjusted my carb and timing where it runs the best. Bad idle circuit maybe?
 
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