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Real quick, you said there is 5 ways air can get past the TB. Well here's what I've figured I've eliminated so far
-ISC (replaced about 30 miles ago)
-EGR (Blocked off and emissions removed as per TSS vfaq)
what's left is:
-BISS (not sure how to check this)
-FIAV (how do i check? can i just do the blockoff like vfaq and by doing this would that eliminate it as the being the culprit?)
-Throttle Plate (I'm going to clean it right now, anything else I can do to check this?)
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