A few issues

[chaos2law]

Hey guys, figured I consult the forum of knowledge on isx's. So about 20k miles ago I changed a leaking injector, thing ran great and got rid of the smoke. Now I'm smoking again (black grayish) under load and my engine break isn't working like before. It's much quieter, takes a few more seconds to really engage and build boost pressure. Once it builds pressure it's still less powerful than before and quieter. Any thoughts?
Second issue, this just started happening last two times at speedco. I get a full pm, and I end up having to purge air from the compu-check nipples on the ifsm to get the thing to steady out. This is a new issue and didn't happen before... any ideas on these would be greatly appreciated.