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Re: P0172 Code
You really don't need any fancy test equipment to rule out a MAF sensor issue on a L67 or L36 SII 3800 engine. As tblake suggested just unplug it with engine off, then restart and see if driveability returns. It will default to preprogrammed MAF/VAF tables. I've run with the MAF sensor in my GTP disconnected for about week until the part arrived. The idle may be a little rough until the engine warms up but better than nothing.
The best way to check for a rich or lean trim giving a P0172 or P0171 DTC indication and what direction to head is check the short and long term fuel trims with a scan tool capable of providing that data.
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