Nissan has had my nissan 2000 gle max V6 3.0Liter/ 96000 miles/ for 30 days, unable to figure out what is wrong ..... Help! .. When it is cold, it will crank (with a delay and a "whine") but it hitches and jumps. I have to rev it to 2 rpms for about 30 mins to be able to drive it --- because if it is not warm enough it will cut off ( even in drive). Nissan has supposedly cked computer diagnositics, 02 sensors, even in touch with engineers. They have tried changing the mass air flow (whichwas replaced last winter) they say they have checked the 02 oxygen sensors ( actually put new ones on that did not solve the problem), have ran tests on the ecm and are now going to pull the intake manifold and say they are not sure if it will fix it. Does anyone have any ideas?