'07 G35 Journey sedan.
The last 3 days the cold start is not normal. It starts fine, but the idle rpm's are in the 500 range for the first few seconds then come up to a normal 1800rpm before decreasing to 650rpm. No work has been recently done other than an oil change about 3 weeks ago. Car runs normally with good power when warm. Outside temp doesn't matter. Cranking speed sounds ok.