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dont take thi sthe wrong way but 1st your positive its not the ac compresser tunring on???
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LOL, i'm pretty dumb, but not that dumb
even if I was, it wouldn't be it, because i no longer have AC
I know it is a vacuum leak for three reasons. I can hear it. My brakes are harder to press. And I have too much fuel pressure at idle.
I'm stumped. I think I'm just gonna replace all the lines under the upper intake and see if that does it. I sure hope so, because it is causing a lean condition and hesitation in the mid RPM range (verified by my AF graph from a recent dyno session)