Randyfo6901

I have a 08' f150 4.6. For the most part it runs good. The engine just has a little miss in it at idle. I have changed the fuel filter. My next step was spark plugs but wouldn't that trip the check engine light?

Randyfo6901

Maybe the injectors. That would not trigger the check engine light, right?

Drooool

what you can do is unplug the coils one by one while it is running. if the idle gets worse then that cylinder is contributing, if the idle doesnt change you know what cylinder is causing the miss. then you need to check for spark, injector flow and compression on that cylinder to find whats causing the miss.

Pioneer58

Check for a possible vacuum leak. It would cause a miss at idle but go away off idle.

Mad Irishman

This

painthorseowner

I thought the same thing.

Randyfo6901

Ok. Thanks a lot guys. Geez how many different vacuum lines are they?

gforceman

I have the same dam issue.. haven't figured it out yet

Randyfo6901

What have you done to fix it that didn't work? I am trying to get straight to the source, ya know what I mean?