Chrysler Repair: 2001 Chrysler Intrepid 2.7l starting issue, chrysler intrepid, air leaks

Question
QUESTION: I was replacing my valve covers due to cracks as wells
changed out my ecm which came up as an error for my check
engine light.  After changing everything I started the car
and it quickly died.  I found that the egr hoses were not
flush and air was leaking.  So I corrected all air leaks but
when I tried to start the car nothing happened.  All dash
lights worked.  I troubleshooted the issue and found the
starter stopped working.  I got another starter.  The car
still won't start.  I hear a tick by the pcm but I don't see
any fuses blown and I tested all the relays on the pcm.  I
am officially stumped.  any suggestions?

ANSWER: Do u have. Gray key.   What were the codes in the PCM that made u change it. And where did u get the PCM from

---------- FOLLOW-UP ----------

QUESTION: I didnt change the pcm.  I changed out the ecm because the
readout from autozone said ecm failure when I brought it
there to find out what why check engine light was coming on.  
What grey key are you asking about?  
I did get my ecm out of the junkyard from a car that was
wrecked but I may try another if I have to.

Answer
The correct term is PCM on a Chrysler.  The gray key that u use to start the car up or is it black.   Did they not tell u what the codes were from autozone    Did u match up the PCM u got with the one that cam out of the orginal car.  If thy are not the same part number they won't work.  Also if the one that u took it out from had an alarm. It also won't start up in yours