1997 2.7 Misfiring Issue

So I just replaced a head on a 1997 2.7 due to the old one being cracked. Got it all back together and I think I’m hearing a vacuum leak and it’s misfiring. At one point it idled at 1500 rpm and didn’t miss, I shut the truck off and turned it back on and it went right back to missing. All 4 plugs have spark so I’m not sure what it could be. Also tried the coils off my 99 2.7 just to make sure they are good, my 99 is my daily and runs fine, and it didn’t change anything, still misfired. So I’m kinda lost now on what it could be, maybe off timing somehow could it miss? Just not quite sure where to go from here, any advice would be awesome! Thanks in advance!

 

Welcome to TW!

 

Maybe try the ecu from the good running truck

 

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