The Pintle valve is the only moving/accessible part on the EGR. When you remove the EGR you notice one hole and one piece in a hole. The part taking up the second hole is the pintle. It should be able to be pushed in and out full travel freely and easily.
I would say clean the MAF. You can drive just fine without a MAF. I unplugged mine and drove around for a few days without it. The PCM will switch over to the VE table when the MAF isn't working. The crank sensor on the other hand could case problems.