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Just a question, but how was the determination made that it was a bad MAF?
There are a variety of things which could cause a bad idle, and the computer code only spits out what it thinks is wrong, not always what is actually causing that sensor to return data out-of-spec. For instance, there could be a vacuum leak after the manifold and the computer thinks the metered flow doesn't match the idle rpm, so it blames the MAF.
Not second guessing the situation, just putting it out there.
I'm a "parts guesser" myself so you don't want to make my mistakes..
Some high-end vehicles use a MAF and a MAP(manifold absolute pressure) sensor, I've been told. No knowledge of that model.
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