When the AC is off the car idles fine but when I turn the AC on it gets pretty bad at times.. Most of the time its ok but it dips really low by itself every 10-15 seconds or when I make a hard stop. Im using HKS Fcon Vpro.

 

I have the same problem, Im using revolver cams and I think it has something to do with that. I dont turn my ac on unless Im on the freeway.

 

I think the typical idle is somewhere between 800-900 RPM. If you are having real problems, you could raise that to ~1000 RPM or so. I tend to keep my foot near the gas while sitting in traffic with the AC on for this reason.

I think there is a how-to on turning up your idle somewhere on here...

 

i can turn up my idle for the ac but if my ac is off my rpms would be way too high. someone mentioned it has something to do with lifters being bad?

 

Its becasue of the cams and the low vac. I have the same problem i fixed it this weekend my tuner raised the idle to 1000-1100 rpm added timeing how it only dips down a about 100 rpm and it hold at 900 vs the 400rpm dip almost wanting to kill the car.

 

idle at 1100 rpm...is that with the AC on?