My SIL's '05 Trailblazer appears to have fuel starvation. He thinks it needs the fuel regulator assembly (or whatever it's called) replaced.

Any solid troubleshooting/diagnosing procedures he can do to verify that this is indeed the issue?

Anyone done this on their Chevy? Is it a DIY at home job? I know you have to drop the tank...

Anyone have an independent or good mechanic recommendation to help us out (is Bobby Z available)???

TIA!