Car has 70,000 miles on it ran fine for 2 days. By 3rd day the car tached up to 3000 rpm on initial cold start. Has rattling sound and slowly drops back down to normal idle in about 30 seconds. It's only doing this if the car has sat still and is started cold. There's no check engine lights and the car is running fine other than that. Someone said that the Rev on start for a turbo motor was normal on cold start, however it did not start this tile the 3rd day we had it. Any ideas? Thanks!
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