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SLK 200 R171 rough idle

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Hi,
had poor performance with car over last week, rough idle poor fuel cons. I took MAF off today and sprayed with MAF Cleaner. performance is better not sluggish now but idle is still rough. Could the MAF be faulty, is there a test for this. and if faulty are the cheaper ones on ebay any good.

I would be greatful for some help thanks,

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