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2005 CTS-V, 1994 Infiniti Q45
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Are you saying it runs fine when its cold? This is interesting......

My only thoughts would be to check the plugs. Possibly an o2 sensor, but that may not necessarily explain only why it is hot. Is the car knocking???? Do you put premium in it? That would be the first thing i would try. If you put regular, the computer has to retard the spark, making it not run right.
 
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