I've been driving a few Dodge vehicles lately (V8 Magnum, V8 Ram 1500) and they both have an idle flare before settling on the target idle speed. Seems like on a start, the RPM's flared up to 1500-ish before settling down to 600. I'm not talking about a cold start where idle starts high and as ECT raises idle drops. This happens even when warm.
Is there anyway to make a GM vehicle do this?