Originally Posted by Neal Eslinger

I had same problem with my 4.6l V8 IAC hose was vibrating into the air snorkel.I cleaned Throttle body, EGR valve and IAC valve with no success still HUMMMM. Then I found a clogged DPFE tube on my EGR tube,mine only has one but most have two so I cleaned it out with a piece of thick copper wire and some carb cleaner and replaced IAC plastic tube with 3/4" Gas hose with the 90 degree rubber elbow that was on the old plastic tube and cutt a 1 1/2" piece of the old plastic tube so I could join them together for a nice fit with no crimping and Presto no HUMMMM and beautiful Idle and perfect throttle response

Originally Posted by tarajerame

so over 15 years later, and this is your best cobble???