Re: Unsteday idle

Posted by TxGoat On 2024/6/1 12:04:22

Defective points, worn distributor bushings or other worn parts in the distributor advance mechanism could cause the timing to "float". Too much friction at the distributor cam/rubbing block could also cause it. A weak spring in the point set might cause it, or a spring that was way too stiff might.
A throttle plate that is loose on the shaft or a loose throttle shaft can also cause erratic idle, and the erratic idle might affect the timing as shown with a timing light.