"Should I just go ahead and change PVC, grommet and sensor?"
For a measley five bucks it's certainly worth a try. I had checked & rechecked the lines four or five times and could find nothing I thought was a leak until seasonalskier said replace the valve and grommet. I was surprised at how loose the valve fit in the grommet, but new grommet we had to sort'a wiggle the valve down in it so it was a much tighter fit.
I've put about 80 miles on it and the CEL hasn't come back on so hoping the PCV was the problem. I owe seasonalskier a cold six pack because I was just before replacing the O2 sensor $53. for the part plus labor.
Please let us know if the new valve and grommet cures your CEL and I'll keep you posted on my CEL. By the way, to clear the CEL, take the negative post loose from the battery for a few minutes then hook it back up. The computer then has to re-learn how to idle, shift points, etc, so it may run a little rough at first.
Yours is a 97 and if the MAF hasn't been cleaned you should review this thread: Clean it first because they're over $100. new.
http://www.automotiveforums.com/vbul...d.php?t=604596
Shorod: I knew about PCV and all I ever did was clean them but henceforth every 20K miles I'll put in a new valve & grommet.