2001 Chevy Impala intake manifold

I have recently discovered a hole in my upper intake manifold. It is the 3.8l v6. I have been driving the car still after using a couple different methods to plug the hole but it still leaks air which in turn causes the engine to run poorly. What kind of further damage could driving it this way create? Is there a quick fix for this leak or should I just replace the part? The hole is in a very difficult spot on the intake.