Where is the PCV valve located on a 2001 Rodeo?

I quickly looked at my engine the other day and I couldn't find it.

 

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hi, i just bought a 2001 isuzu rodeo s 3.2 enginebecause they look sonice but adid not realize that this vehicle had a big problem the problem is that in the mornings when its cold the engine runs very rough high and low idle and some times the engine shuts off when driving i took it to the dealer but they could no find nothing wrong because there is not any displayed codes or store in the ecu,, pls help if any one knows about this problems