i have a 2000 ford explorer with really low miles and now that its getting cold outside when i first start it up in the morning it has the worlds shittiest idle ever. the thing will rev up to a little over 1k then drop down to like 200 and bounce around then die. if you dont keep your foot on it it'll die. it takes about 5 minutes of this before it settles out and runs fine. anyone have any input on this?