When its started after overnight, it fires up without a problem, then idles hard. It will rev to about 12-1300 rpm, then almost stall; it does this until it warms up. If you get in it immediately and drive it, it will almost stall, but then after 4-5 seconds on "almost stalling" it takes off. If you drive it through the gears once (it's an auto) it's fine after that. It will also do this after sitting for an hour or longer. I hope this helps out some. Scott