The reason I ask is because on my 95 ZX-7 there is (was) an emissions vacuum valve that variably pressurized the carbs and caused some running problems when it wasn't working correctly. The fix was to bypass the valve and run a line directly from the OEM air box to the rail on the front of the carbs. However, I'm not sure if a 91 works the same way. The vacuum hoses seem to be very important on mine and was wondering if perhaps something didn't get hooked up that was hooked up before the carb work.
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