Ok I appreciate any help. But sometimes I get around 9 lbs of boost. Then it will only get 5 lbs. I do have check engine light on for a o2 sensor. But I have put a ecs race n75 valve. And new dv 's. Would a o2 sensor cause this

 

Any help.

 

Check for a boost leak. After I put my motor in I was having the same problem and I boost leak tested and found a loose clamp. Start there and if you don't find anything check you MAF it could be going bad. You could also try putting your old n75 back on and see if it still does it.

 

Thanks for the help ill try that. I don't know if it was the dvs I got them from eBay there adjustable. From 6-18lbs