Multiple error codes - p0108, p0244, p0112 and p0102

[apwbee]

Yesterday whilst climbing a bit of a hill, i got 'engine service required' and the engine management light, car still ran. It got me home, and originally the error code was just P0108. I let the car have a rest over night and now i have p0108, p0244, p0112 and p0102. Logically they would all be linked. Anyone got any ideas where to start. I tried pulling out the MAF and the engine stayed exactly the same, plugged it back in, still the same...