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redone

520 xls 20 hp pulsate ideling

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redone

This problem just started. Motor has ran fine this summer. But it sits alot. Now engine starts fine, runs but pulsate in idel. Raise the speed comes out of it till at very high rpm. But still dose a little rpm run high then come back down,

Could this vacuum pump become weak?

Thanks for your help.

Bill

 

 

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peter lena

do you ever use stabil gas treatment ? or any other fuel additive like seafoam ? that sitting issue ,makes me think of a possible gas cap issue . sound like a fuel dirt possibility, any other engine details you can give ?  last tune up service , fuel filter , air cleaner , etc. pete 

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