The first 3 codes can be caused by a variety of things as has been suggested. The P0100 is a little odd (I've never heard of it). Did you replace the MAF yourself? Is it OEM? There are a lot of cra* MAF's being sold for cheap. A lot of cheap parts work perfectly fine, but often not cheap sensors of any kind.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra