egr blockoff plate causing check engine light

[Kennedy]

I have turbo bark once in awhile, is there a cure or do I need to update the computer at GM

Looking at your signature I'd say that you need to rid yourself of the EGR one way or another. A functional EGR greatly reduces the effectiveness of added boost by adding more EGR flow.

Back in the day we used to band aid lesser chips with Boost Sticks and Fingers Sticks simply because that is all we had. Now we do it all (and MUCH better I might add) in the ECM programming.