P1188/89 with fluctuating idle

[bbmlpoole]

I have a '00 2.5I Z3 with 148k. Idles ok when cold, but after it gets a little warm, has trouble finding idle. Surges up and down before settling in. Will die when you slow down from highway speeds. Throws the 1188/89 codes, which indicate a fuel problem. Thinking it may be either the Crankcase Ventilation Valve or the Idle Control Value. Any experience or advice?

Thanks..

[bbmlpoole]

Found the problem...gaping crack at the bottom of the air flow tube between the MAF and the intake manifold. A round of duct tape firmly in place while the part is on order. (do they make german duct tape?)