Question

Islet amyloid polypeptide: pinpointing amino acid residues linked to amyloid fibril formation

Answer 1

This is a common problem when the idle air control module is not functioning as it should. This is a component that helps to monitor air/fuel mixture at idle speed. When this is not working properly, this causes an imbalance in the air/fuel mixture resulting in intermittent or abnormal idling as you've described.