My 2006, E53, N62, 4.4, 13.000 km, stutters a bit (maybe misfiring) on rpms up to approx. 1.500 when cold during warm-up. A few minutes (ca. 5) after temp gauge reaches top, the stuttering stops abruptly and all is fine.

Anyone that can share some facts about what differentiates engine management during warm-up from engine management while warm?