Tooljunkie said

If carb hasnt been touched until recently, i would say its likely in need of a good cleaning. Never mentioned what engine it has and if its a 2 barrel Or 4 barrel carb.
Had one this spring that all it needed was a good cleaning and it ran perfect after.
Another trick is to pull air cleaner, rev engine a little and push choke plate closed,as plate closes snap throttle.sometimes this dislodges the dirt that is fouling the jets.

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