I have all of a sudden been having an issue with my idle dropping down when coming to a stop of just manuvering around low speed,and dies on occasion,act like a vacuum leak in the sence the idle hunts for a moment when it drops,but then it doesnt act like a vac leak the way it runs and idles in park or in just sitting.Now I did install longtubes&highflow cats 2 months ago which can effect tuning I know but it seems I noticed this a couple weeks after the LTs went on.Any ideas or suggestions would be appreciated.Gnz

 

Have you check for any exhaust leaks?
A leak could be fooling with the O2 sensors.

 

You are right that the smallest can throw off the sensors but the best I can tell these headers/sensors are sealed up solid.

 

re-torque your header bolts down . . . get the engine hot, and try tightening them again.

 

Appreciate you guys tossing ideas, I retorqued after the first day and last week,it was good and hot,Seems I dont even have a peep out of this exhaust as far as leaks I detect.

 

Could be a fuel pressure reg problem?

 

Any big swings in temperature. Real cold will make it hard to maintain heat in the front 02's with long tubes and they'll sniff different/wrong AF when cold vs hot. You mentioned idling around and at a stop. Just a thought and way out there I know.

 

That makes sense,you may have nailed it,been cold as a witches tit here a while.Some tuning may compensate,I just didnt want to cover up a problem,being that its cammed will effect it to. I just dont remember my last truck doing this in cold weather,It did have a smaller tubed header and OE cats instead of highflows.Thanks