Maybe disconnect the electrical connector at the MAF and see if the car runs well afterward. I've never done it myself but I've read here that the car's computer reverts to a lookup table when it looses communication with the MAF. In other words it doesn't hurt the car to temporarily disconnect the MAF as a diagnostic test. It's worth a shot since disconecting the MAF is so easy. I'm no expert, so take this with a grain of salt.
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