Did you put a breather on the ISC? If so don't do that. The ISC must suck metered air, or it will idle like schyte. Actually, It will idle wierd. I've had it run great with a breather one day, and the n suck another day. So run a nice tube from the isc to the accordian pipe.
About the "spewing exaust" That is blowby. Blowby is bad. PCV stands for positive crankcase ventilation. The "positive" means that in order for it to work right, something has to suck on the block. So breathers on the valve covers are a bad idea. The throttle body has a check valve on it to apply a small amount of vaccum to the crankcase. The crankcase is also connected to the accordian pipe, so when the motor is boosting, the accordian pipe applies a light amount of vaccum to the crankcase. All of the vaccum in the crankcase improves ring seal and reduces blowby. If the valve covers are smoking out the breathers badly then you would benefit from new rings. However routing the factory pcv system back in would reduce the blowby a tad, and would be much more pleasant in general. At least with the factory pcv setup the oil is stored in your intercooler, where it can be removed and disposed of, rather than spewed all over your engine compartment.
Just my 2 psi...
