Yea, my turbo motor does that too. Cant really say i've really had time to look into it seein as I only drove my car for two days before finding out i need my engine rebuilt. But while cold the rpms fluctuate from 1100-1600 in a rhythmic manner until it comes up to operating temp. The guys who installed it said that it was normal, but seeing as how they told me removing the thermostat and jumping my cooling fan to run all the time would fix my car overheating, don't really trust their word.
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