Yeah your symptoms are the same as mine, disconnected the cold start injector and there was no difference, so i assume there is a fault with it or the computer or a sensor which controls it, when its cold i have to just rest my foot on the throttle to start and then it is fine to idle and warm up on its own.
Anyone got any ideas what sensor to check or hoe to check it there is any output from the cold start injector plug on the loom, what do i have to lookfor, i have a good fluke multi meter to use, any help thanked in advance.