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I would think that the valve train would be RPM sensitive with no regard to load..... Correct me if I am wrong..... Remember I am a old Diesel guy here so these light weight go fast engines are kinda new to me



Load will aggravate the issue because if there's no load then the mixture will light off fairly easily. If things aren't sealing properly, under load it'll show up. One reason why tuning for drivability needs to be done on a water brake type chassis dyno instead of an inertia/roller dyno. The engine thinks it's powering a vehicle that's as heavy as the roller is so it'll hide a lot of drivability issues.