it is a 3.3 L 83500 miles on it just bought it 1 month ago. has newer plugs,wires,air filter,fuel filter, has a coil pack .idle goes up and down the colder it gets out the car will almost shut off at start up. Then it 3 sec. it will go to the rough idel again.it always keeps running.It does not stall.Any help would be great!If you need more info let me know.