So i have a stock LS with about 40 k and im running a drag kit with 440cc and a 255. I have driven it about 1400 miles with the turbo and uppped the boost yesterday to 9.5 psi. Today it was running fine all day untill this evening where for some reason it began to idle real lean. my a/f was at about 16.5 give or take .5. and it was surging really lightly. this hasn't happened before. anybody no why?

Please help.

thanks

 

ems setup?

 

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