Backfire during 2step use (video)


I have a condition where the engine is sputtering and has an occasional minor backfiring through the intake but only while using the two step under load. The edash shows lean afr during the popping.

I would first consider this being due to a vacuum leak, but I cannot duplicate the problem when using the foot break, or any other driving conditions. Only the two step. If I slowly roll into the throttle on the two step it will sometimes work. But you can’t do it that slowly during a race. Any help is appreciated.

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