The air mass meter can cause som running problems like you have described without being serious enough to trigger the check engine light. If you know someone with a M104 HFM engine or have another one nearby, you can swap the air mass meter with a known good one and see of the problem goes away. That would be a quick and easy way to see if the air mass meter is the problem.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record