5.4 won't idle
 

I hope this is just a coincidence that I SeaFoamed the Brake Booster line a week ago.

The problem is that the truck will barely idle at all.I thought it was the IAC, but I changed it with a brand new one and no difference.

I also changed the PVC valve a week ago.

It sounds like it wants to die and the truck adds a little throttle itself to keep it alive.

I'm NOT getting a check engine light so I'm stuck. The plugs are not old either, maybe 15k miles on Autolite plats.

Any ideas, please help.

check the throttle position sensor... and may be the seafoam clogged up somewhere in the intake and it causing poor fuel mixture? have i tried half throttling the truck and spraying throttle body cleaner in there or B-12 as its called.. that should nock out anything. in the intake system.

check your injectors
 

hey, check your injectors. i had the same problem last week, chased it down all week. finally pulled the injector it was clogged with white powdery stuff. i put seafoam through the brake booster, and some in gas tank the day before that happened to my truck. it's worth a look.

yeh u can take it to dealership and have em do an injector flush for like 65 bucks is about what it costs