Bike keeps stalling off idle

I have an 07 250 XC-F with a recent new top end. It ran perfectly on the breakin ride but I brought it home, changed the oil (Spectro syn 20-50), cleaned the screens, and cleaned the air filter...and now it stalls when you goose it off throttle. I can't imagine what I could have done to mess it up. Anyone have any ideas? I'm at a total loss.

Thanks!!

Spark plug cap

I did check that, it seems to be on tightly. It runs if I keep the revs up but if I goose it off idle it just quits. Ugh.

Just because it is tight dosent mean it is good. Could be damaged internally. Change it out. They are not very expensive

Check you AP diaphragm

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