furious_rotation

I have a 93 rx7 basically stock other than a 3'' dp and 3'' catback. My problem is that for the last couple days my second turbo isn't hitting until 6500k sometimes closer to 7. It used to hit at about 5k or 5200k. My primary turbo is working perfectly the way it always has, hitting hard and hitting when it is supposed to. When my second turbo comes online late it doesn't feel like it is spiking it feels the exact same as it did when it hit at 5k just higher in the rpm band now. I checked all my charge lines and nothing was loose so I decided to check for loose vacuum lines but didn't see any. I haven't taken off my extension manifold to see if any popped off under there. I really am not sure what the problem is. Like I said everything feels the same as it did when it pulled hard at the right rpm except not my secondary turbo is just hitting late. If anyone can help me out here please do because I want to get this fixed as fast as possible. Thanks.