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Same problem with my KA. Pulled hard and ran fine normally. I found a tiny vacuum line on the back-left side of the engine that had torn. I replaced the line a few months ago and haven't had a problem since. My onboard diagnostic system never threw a code and I did the usual cleaning and unpluging various sensors, etc.
Bottom line, KA's have tons of vacuum lines and they're all old. There's bound to be a leak somewhere.
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