Rough idle in gear only?
The new truck (02 4.6) seems to have an odd idle issue that feels like a slight miss or injector. It only does it while sitting in gear with my foot on the brake. Put it in neutral or park and it's fine. It shows no thrown codes, cleanest smog test I've ever seen, and runs absolutely perfect otherwise. It's really not that bad but something has to be causing it. Is there anything transmission related that can cause this? Motor mount? Harmonic balancer?
Thanks for any advice or things to check for.
Edit: In a search I found it's pretty common with the 4.6 and not much can be done about it short of changing the cam profile.
Last edited by 2Tight; 05-05-2010 at 12:26 PM.