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im swapping a 2003 4.6l romeo engine with a 2005 4.6l romeo engeine and the 2005 doesnt have an iac sensor will that affect the computer since the 2005 isnt manufactured with one
You have to use your 2003 throttle body and associated parts. You may have to swap the whole intake. Off the top of my head, the EGR system may be different too.
The 2005 throttle body is fully electronic, the 2003 is cable operated with an IAC.