After warming up a few minutes with smooth idling, the idle then starts galloping with a cycle of about 3 seconds and an RPM change guessed to be from 700 to 1500 or there abouts. On cooling the whole cycle can be repeated i.e. smooth idle while cold, gallop when warm. When driving (216k) it runs fine with good mileage (22-24 at 55). No apparent other issues: wires OK, coolant OK, plugs OK. Where should I start looking? |
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