900xp in for reverse chain. Pick it up and has hard time starting. They give me the bs about bad gas so they add octane booster. Still have to 2 foot it. Then it won’t idle. Service manager takes it out on their track to "blow the injectors out". Comes back, after a few laps, says it’s running fine and it dies. I’m pissed cause he says it just needs to be ran. BS…… So it has new gas and new plugs. Finally ran it and it did start idling fine. Still very difficult to start. What are
the possibilities? O2 sensor maybe?

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