low voltage means the mafs not working anymore pretty much or bad wires, or bad fuse. for what ever reason the pcm is seeing low or no voltage from the maf.

if you unplug the maf then start it up. it might run better.

not sure how the v8's are about after market mafs, i know the 3800 like oem mafs only. so if you got a aftermarket maf or a cheap china one. that could be the issue.