1999 Ranger has a small jerk when I stop and take off.

[wdpropes]

I have a 1999 ranger that has a small jerk in it just before I come to a complete stop and when I first give it gas to take off. I don't know if it is the transmission or what. Also the door ajar light has started staying on while driving. I can't find the striker on the door that the door hits. If anyone has an answer to the problems I would appreciate it. Thanks to Al the speed sensor fixed my ABS light staying on problem.

 

[RangerX]

I would get underneath, and take a good look at driveshaft u-joints and flange bolts, and u-bolts on the rear axle.
What transmission do you have stick or auto?

 

[chbtech]

Your truck does not have an external striker and switch on the door and door post. The switch is inside the door, attached to the latch mechanism. There's an excellent replacement procedure at:

www.therangerstation.com/tech_library/DoorContactPin.html

 

[rwenzing]

I have a 1999 ranger that has a small jerk in it just before I come to a complete stop and when I first give it gas to take off.

That is the slip yoke binding. Ford has issued about a dozen TSBs on that over the years. Search on "slip yoke" and you will find numerous threads on the subject.