A friend of mine has a 1998 C230 with 170k miles on it. It idles really rough and is kind of jumpy under acceleration. It throws a check engine code for low idle speed and for the MAF sensor. Is it common on these cars for the MAF to go bad? I don't want to have him throw money at a MAF just because he can.

Also, the car has 3 prong spark plugs in it, they didn't look terribly worn, but if they are wrong, they probably aren't helping.

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