WHat year 4.0 did they stop incorperating the EGR valve and tube and go to an IAC versus the idle step motor?

WHat year 4.0 did they stop incorperating the EGR valve and tube and go to an IAC versus the idle step motor?

Wow, that's like a trivia question. And the reason for your asking? My guess would be when CC started putting in the H.O. version of the 4.0L ....1996?????

The reason for the question is I have an 4.0 HO and I want to put it into my 89. Thought that I could just use the block and head then bolt all the other "89" intake and such to it. I could just find and harness and ECM to replace the "89" harness and ECM.