i have an 01 5.4l 4x4 super crew starts fine idles a touch rough runs ok till warm then when touch throttle slightly it bucks and jerks around. It is not throwing a code i have replaced the mass air flow,fuel regulator all did not work or make a change. Any help that could be given would be greatly appreciated since my mechanic and i are both at whits end.

 

clean or replace the IAC.
I'm having the same issues with my 4.6

 

$45 from rockauto, there is 2 left I just bought one!!!!

 

thank you all for your help i will try it today and see what happens.