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Q: Long Crank on 2003 Mazda Mazda6

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Just bought me a Mazda 6 -03
Sometimes, about every 5th time I start the car it needs some extra long cranking before it starts.
I thought cleaning the MAF-sensor would fix the problem but no..
According to the service manual, the spark plugs where replaced recently.
Anyone who can give any suggestions on what the cause could be?
(1) Answer