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It sounds like you may have your idle speed set too low. Try setting your idle speed at 625-650 rpm with the transmission in DRIVE and the AC turned off. Also, check you ignition timing and set it at 14°-16° BTDC with the vacuum hose(s) removed from the vacuum advance and plugged.The clunk could be caused by broken motor mounts or transmission mount.
It sounds like you may have your idle speed set too low. Try setting your idle speed at 625-650 rpm with the transmission in DRIVE and the AC turned off. Also, check you ignition timing and set it at 14°-16° BTDC with the vacuum hose(s) removed from the vacuum advance and plugged.
The clunk could be caused by broken motor mounts or transmission mount.