Yep, I suspect fuel issue. I got this same issue a few years back (pre-S/C). I changed out my PCV and fuel filter, but found that it still did it on occasion. I tore down the fuel rails and cleaned out the injectors really well and reinstalled. Problem solved. A lot of dirty work for a simple fuel injector cleaning, so maybe there is an addictive you can try in your gas to clean out your lines to hopefully avoid this process.