Stalling Issues

Ok short bit of info.
Couple weeks ago I replaced my clutch and in the process I broke the EGR sensor and had to replace with no issues.About a week later my check engine light came on,so I started looking under the hood and found that the elbow for the PCV was cracked causing a vacuum leak.
Well i replaced that now the car will idle good but it will stall alot of times when I push in the clutch due to the RPM's dropping low.

Now the check engine light is still on and the problem still there.Read the codes and they are,
P0171 (O2)
Po174 (O2)
P2195
P2197

The 2197 I was told was a MAF sensor.But Im told it also could been a vacuum leak.Im thinking that busted PCV elbow is the cause of that code.Not sure about the 2195.

Any suggestions? I made sure the O2's were connected when I did the clutch,but will give another check.

Thx for the info.
I leading towards a vacuum leak since the elbow for PCV was gone then earlier I changed out another vacuum line that was really rotted but its still happening.
I havnt removed any couplings.The only thing I did in the engine compartment was change out what I think is a DPFE sensor right at the back top motor just above the top 2 tranny bolts.I broke the nipple for the vacuum line and replaced that sensor then it started all this couple days later.
Wonder if maybe I got a bad sensor.
This is what I replaced:
http://www.ebay.com/itm/New-Motorcraft-EGR-Pressure-Feedback-Sensor-E150-Van-Mercury-Tracer-99-98-Car-/140537558464?_trksid=p3284.m263&_trkparms=algo=SI&its=I&itu=UCI%2BUA%2BFICS&otn=21&pmod=150758567720&ps=54

Edit: No aftermarket intakes or anything,just the stock shaker scoop.