New here and impressed with the collective knowledge and wit. My recently acquired 2007 MP3 250 has 12k km and runs quite well (new battery, valve adjustment, tires, new voltage reg, throttle body cleaning including idle bypass port) with this one exception: when first starting, the throttle must be feathered for about 20 seconds or so until the ECU kicks in and then maintains at around 1800rpm. No problems after that. Otherwise it will sputter out. But if I don't take this step and take off directly after starting, it will stall when coming to a stop. I've twice cleaned the idle bypass port with no positive effect for this problem. Any ideas?
Thanks in advance!