Air filter is new. Cleaning the MAF is a good idea but I've heard that the problem usually comes back if only a cleaning is done. I'm doing this for someone and don't want them coming back in a few weeks with same complaint. Have you had experience with cleaning and lasting results. Do you clean with aerosol, such as brake cleaner or do you use a swab and alcohol?

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1972 450SL
1982 300D Turbo