Classic Cars & RestorationQuestionCommunity Starter

2024 Subaru WRX Premium — carbureted engine stumbles only when I tip into throttle

TruckTech84Community StarterJan 16, 20262024 Subaru WRX PremiumPennsylvania
Idle is decent and it cruises okay, but a quick throttle input makes it stumble. I'm trying not to change three things at once. Accelerator pump, timing, vacuum leak—which test would you do first? Any data points from owners would help.
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