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Hey guys i have a 2016 trx 420 foreman, it has started to idle up and down (hunting) but only happens intermittently? No codes, no wiring disconnected.
 

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welcome to the forums. sounds like dirty injector ?, lack of fuel ?, weak fuel pump ?.
 

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Welcome to the forums!
 

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The fuel pump and filter is in the tank. It may have (or had) some rotten fuel in it, so I'd pull those out and have a looksee.... Get a copy of the service manual if you don't have one yet for reference. Let us know what you find if ya can... Welcome to the forums!
 
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