Help: Couple of questions concerning my suv?

Sean

Member
1.) I know that vehicles have a check engine light, should you only scan for codes when this light (check engine)comes on?
2.) It seems like my vehicle is running a bit for rough in the winter than it did in the summer time, is this normal?
3.) Sometimes when park whether it is an incline or flat, the gear shift is hard to move out of park. What could the problem be?
4.) Are you suppose to feel a jerk when shift from park to drive, park to reverse, drive to reverse and etc.?
5.) How do you know if your transmission is shifting correct? How smooth is shifting gears suppose to be? I notice sometimes that it kind of linger when shifting into gears. Like a drag feeling before actually shifting.

The vehicle is a 04 Explorer EB with a 4.0 Automatic
 
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