Build: LS 2006
KM: 75,000
Fault: Hesitation/Lag/No power at low rpm, sluggish, increase in fuel economy. Engine light on intermittenly with P2008 code, Intake Manifold Runner Control Circuit/Open Bank 1
Faulty IMRC soleniod, Ford part: F0 4M5G 9J559 NB (Around $60-$70, Control Assemb Choke).
5minutes to install, very easy. Reset fault codes/
ECU after install.
Can also refer to this thread
http://www.fordforums.com.au/showthread.php?t=11352173