I have an 03 sierra with a 5.3 with a front mount. I just got it back together last week. It has a new cam with 214/216 with 115 lsa and 598/559 lift. I was previously running a 6.0 with an ls6 cam. My problem is that it idles too low and dies when you turn the wheels or turn on AC and also coasting up to a stop. I am running a speed density tune with a 3 bar. I haven't had it retuned yet but my a/f is pretty good, a little rich but not bad. My tuner is sick Rt now so I can't get it tuned for a while. any ideas?

 

Needs more base running airflow probably...how does it do returning to idle from a rev in neutral or driving around? What is your idle speed set to? Idle manifold pressure? Idle spark advance?

Its tune related....

 

there different tables that needs to be adjusted to correct idle parameters, i don't see another way to fix it...

 

Do you have tuning software? If so, what is it?