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2007 yamaha yfz 450 wont hold idle


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got a 2007 yamaha yfz 450 that wont hold a idle runs awesome when on the gas but as soon as i let off it dies. mods i got done on it are full trinity racing pipe, dyna rev box, k&n air filter. running a 190 main jet rest of the carb is stock. set my idle screw all the way in and all the way out and everywhere inbetween and get the same result. was told there could be a vacume leak, anyone else run into a problem like this?? also has anyone herd of any EFI conversion kits available?

Edited by Drmundy
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