Dodge Repair: dakota, pcm, alarm system

Question
yes i checked fuel and spark, before i changed the pcm, it woudlnt even turn over now it fires but wont start it started yesterday for like 3-5 seconds and that was it

Answer
did u get used PCM?  and did that PCM have an alarm system in it?   if it starts and runs for a few seconds then dies and u do it 3 times then u get nothing  more then likely an alarm issue.  This might be out of novas hands  and might need to have a pro take a look at it.