John Deere Z930A running only on 1 Cyl

Jeweler

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I have a Z930A and been a great mower has 490 hours and now is running only on 1 cylinder replace the simple spark plugs and it didn't fix. Any recommendations would greatly be appreciated. Thanks
 
More than likely your ignition coil, which produces spark. Just follow the spark plug wire and you'll find it. And clean out any debris ( if any)
 
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