First and foremost, this forum is awesome!
Second, this sounds very similar to the problem I'm having right now. I had my check engine codes checked at Autozone and it came back with a bad O2 sensor and mass airflow sensor error. I replaced the mass airflow sensor today, and when I went to start it again, it started, ran for 1 to 2 seconds, then died. I started it three times and got the same results. I took it back out and it stayed running. The air filter that is on it is a K&N type. It's not the original box type. It is a little too big and I had to tape it on. Could that be part of the problem? Or am I looking for something else? Any help is GREATLY appreciated!!