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Originally Posted by maverick  The needed air being high makes me wonder what the MAF is doing? Might want to just give it a good look and maybe clean with MAF cleaner or aircraft grade electronics cleaner. |
Thanks maverick for your continued help.
I have a spare MAF so I will give it a try. I assumed "i.s." was idle speed so didn't think of the MAF, and I also though that a bad MAF would give a fault code. But I have read that the MAF can be a cause of backfires so you might be onto something.