E36 M3 Evo stutters?

[supermanraf]

Just wondering if anyone has any experience with the following symptoms: car is fine under acceleration, however holding a steady throttle, at almost any speed, the car has developed a minor stutter, doesn't feel like a misfire, and only does it Once the car is warm, say after 20 minutes of driving.

Has anyone experienced a similar problem? And if so, any recommendations?