I have a o3 f250 that I only use to pull my camper so I don't use it much. When it sits for a week or so and I go to start it, it's starts wide open. I don't mean fast but wide open, like I have the gas pushed all the way to the floor. It only last a second then goes to normal. It's not like most cars will start when it's cold and the choke is on. I think of it like a stick of dynamite going off. You have one big bang and normal.Today it sound like it spun the starter, kind of like when you turn the key when it's already running. The longer it sit the faster it rush. Ideas?