I have an 02 LB7 and I've noticed here the past month and a half as the air temperature here in Indiana has been averaging in the 30s, that my truck hazes at idle. It only does this when the air temperature is cold out even after the truck is warmed up. It's not burning oil or making oil, the oil smells like normal used engine oil, I am not using more coolant than normal, it doesn't knock, it idles smooth as can be, and the performance has not decreased by any means. The injectors were replaced in 2006 under the GM warranty at 104,200 miles and the truck now has just under 180k miles. The only thing I have not checked is the balance rates. I know that'd give me a definite answer as to whether or not it is the injectors or not but what else could it be? The air temperature here yesterday was in the 60s and it was not noticeable at all. I started it up this morning when the temp was back down in the 30s after sitting for over 12 hours not plugged in and it blew a puff of blueish/whitish smoke out immediately after startup. That's another thing, when it's cold, sometimes it blows that color and other times it won't. When it's warm, it just sends out a VERY SLIGHT puff of black. The truck has EFI Live DSP5, FASS 150, Modified LBZ CP3, rail shims, and a PPE boost increase valve. I run 8oz of Stanadyne Performance Formula(Blue Bottle) to my 26 GAL tank EVERY fill up as well. I'm just curious as to what this may be because the only bad injector symptom it is giving me is the haze and nothing else. Like I said it runs great and idles smooth as could be and doesn't miss. Sometimes when it's cold and I start my truck up to go to work it will lope once or twice 20-30 seconds after starting it as well. Any help would be greatly appreciated! Thanks!