Reconnect the tubes from the valve covers to the intake like they were from the factory. They are there for a reason, positive crankcase ventilation (PCV). Keep the catch cans in the lines if you want. And yes, there is a difference between ventilation and positive ventilation.

The reason your idle changes is because you are creating a vac leak by disconnecting the hoses.

Without PCV your engine can sludge up, big problem. Read here for more info: http://www.yotarepair.com/Sludge_Zone.html

Last edited by mt_goat; 05/23/08 04:08 PM.
93 4X4 ext-cab, auto, SR5, 3.4 V6, supercharged, 2.1" pulley, URD fuel mods, Aquamist WI, IPT valve body mod, dual cases, 4" superlift, Alcan springs, 33 BFG MT, ARB locked front & rear, 5.29 US Gears, RB 1" BL, 1.5" BJ spacers, TJM T-17, Warn m8000.