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I don't think that working the accelerator pedal on a CIS 911 does any more than opening the throttle body. It's not like a carburetor where you are injecting fuel into the intake manifold by working the pedal, running or not. What it would do shortly after cranking and start up would be to put the engine in a lean mixture situation and that is what creates the backfire/air box explosion/pop off valve operation. Am I wrong?
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