93 zj 5.2 no spark...sometimes

I just got a 93 Larado 5.2 4x4. It runs good when it runs. Sometimes it gets no spark. I pulled the power wire from the coil and its not getting power sometimes. When it gets power the auto shutdown relay clicks alot and with a test light hooked to the coil pigtail the light gets brighter as the relay clicks then the clicking stops and the light goes out. Then I can start it...sometime, but sometimes it still wont start. I have done the door lock thing..lock unlock...disco'd the battery and touched the ends together...replaced the coil...
I am lost and dont know what to do. Could the ecm be bad? But remember it runs good when it does start up...its just hard to get it started, and it will only start after the relay does its little thing. Now its not getting fuel?????? Is the alarm f'ed?

did some testing tonight. i think i figured out this problem. looks like the vtss is bad. will be going to j/y tomorrow to see what its going to cost me.

well it was the computer. it runs great now. well did i kinda blew the radiator up on a very steep hill....got it on video....

https://www.youtube.com/watch?v=kuLd4v674qA

now the computer works great....you just need a new radiator now