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Has someone actually SEEN the throttle body closed while you are driving and shifting gears? Like, keep engine cover off, passenger stares at throttle body while driving? If its revving up and NOT stumbling or missing while shifting, then it is probably getting proper air and gas, which could only mean ICV (unlikely it can provide enough air flow for redline/high RPMs), or throttle body.
How much flow across the maf are you seeing when the problem happens? The same flow as intended full throttle on the pedal? That answer should debunk a few myths here
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