DME = PCM, ECM or engine management computer
GMIII = body control module
Follow the air tube past the MAF sensor. Check all the clamp connections. Use a screwdriver to tighten them. Check the flex bended portion. Over time, a crack will develop there. Listen for any vacuum leaks with the engine on.
A quick DYI video check.
https://www.youtube.com/watch?v=ue3N5Pg9yJw