Classic Cars & RestorationQuestionCommunity Starter

Carbureted engine stumbles only when I tip into throttle

EVGeek62Community StarterApr 15, 20262022 Lexus GX 460San Diego
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? I'd rather test this logically than start replacing parts.
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WrenchWrench31Community StarterCommunity StarterApr 17, 2026permalink
Log the conditions before you spend. A pressure test beats staring at a dry driveway if the 2022 Lexus GX is losing coolant with no puddle. If the cheap test changes it, stop and reassess. On “carbureted engine stumbles only when i tip,” that was the fork that mattered for me. If it doesn't change the out-the-door or the repair estimate, it's noise. This is the filter I use when the thread starts repeating itself. If it repeats twice more I'll book time.
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