I have to check out this problem too. Although good advice, I wouldn't just adjust the striker. That may put wear on the door latch mechanism itself. Plus the striker more than likely isn't the culprit, rather the hinges themselves.
Open the door a little then grab the bottom rear of the door and try to see if there is any up and down play. If none or a little, I would try to adjust the hinges first (as everyone else has so mentioned
). Try to take into account that the car itself may move.
If there is a lot of up and down play and its "feelable" I would do the hinge rebuild kit. The Paddock has them but I don't have any feedback as to whether they're any good or not.
Another "mickey mouse" thing I was thinking of as the hinge bolts can be a little tricky to get to, is with the door open and supported with a jack (use a large soft towel under the door where the jack pad hits it so you don't scrape the paint), loosen the 4 bolts on the door side of the hinges, then remove the bolts on the door side of the lower hinge. Place spacers (washers?) between the door and the hinge then replace the bolts and snug all of them and SLOWLY close the door to check door position. Readjust in the same manner.
What ever method you go by, make sure that the front of the door doesn't hit the front fenders when you close the door!!!!!
Use the body side molding as a guide as far as the level to adjust to. The molding is really handy in that repect.
