GM-GMC: 2001 Aztek, car wont start, correct key

Question
My Aztec wont start i have the pass-key3 key but now where i turn my car on where the key goes its stuck in the Acc stage and the car wont start.

Answer
As long as you are certain that you have the correct key for that vehicle there are only two possibilities.  One is your key is worn to the point where it will no longer work correctly, or, your ignition cylinder is faulty and will not longer accept that key.  Both are good possibilities.  I would have a new key cut (not a pk3 key just a cheap one) and check to see if the new key works in the ignition.  If it does, have a new PK3 key made and you are off to the races.  If not, you may need to have your ignition cylinder replaced.
Hope this helps