I never really asked, regarding the idle surge thread. How much of a surge is that referring to? In our case it's a good 500-600 rpm.
I hope the video clip don't breakI hate the " most of the time it breaks " sorts of replies. I'll see if there are any good video clips too.
Any one ground will cause issues. It's not a fun rat race wire chase but I'm betting it's going to be your issue.I'm not sure but I think in cold start up it has a set of perimeters the computer uses.
Lets ask a few questions since this is a transplant.
Are all the factory grounds in place?
there are several that are very important, one in the injector harness, two computer grounds, and one that grounds the engine to the firewall, the locations can be found in the 'surging idle checklist'. Is the ACT sensor present? Is the engine temp sensor present? It is located on the heater tube that runs down the passenger side of the intake.
How is the fuel system configured?
Maybe a pic of the engine compartment would help.