The choke valve adjusts air pressure through restricting an intake manifold to deliver a richer air/fuel mixture. It is typically on carburetor engines and applied during a cold start.

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Rough idle while warming up, goes away after a tiny rev

I have an 84 Ranger 2.8L V6. It seem that nearly every time I start the car, it has a pretty rough idle while it warms up. If I just rev the engine a little bit for a second and release (just barely ...