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I had that happen once on my new 1976 Camaro LT.

It was a bad tach and was changed by the dealer.

I suggest the same to you! Get it changed by the dealer on warranty!
 

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Has anybody noticed erratic RPM when the engine is cold?

Lurn 2 Spel
What`s your definition of erratic?...Mine (2.0T) floats between 1000 and 1200 for a few seconds before settling down at 800, same as all my other vehicles.
 

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How long has it been doing it? If it is a common, daily, event call the dealer or take it in.
OK when warmed up, right?
 
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