I had an issue with my Blitz BOV surging. I took it all apart, cleaned the piston walls, re oiled the seal, RTV'd the top back on and it has worked great from that day. It may help to take it all apart and give it a good cleaning. I bought mine used from a friend that had only around 6K miles on it, but it did help to give it a good cleaning. They are not hard to take apart, just watch out for the large spring when you take the top of. Good luck.
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