I have to jiggle the key to start my truck

Hello,

There are a few possibilities. If you are having to giggle the Key in the Lock Cylinder.

1) Worn key

2) Worn Lock Cylinder

3) If key has chip in it it may be failing

4) One other is the Security System if has it

If you have a Spare Key you haven't used I would try it, if doesn't fix it would replace the Lock Cylinder. Here is how you can replace it. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Checking to see if you replaced the Lock Cylinder and if it fixed the problem.