How would a mustang act if the lower intake was leaking????

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GreyGoose said:
Leaking air...........
if you're leaking air, you'll hear a loud hissing noise. you wont really notice mich difference in idle, it'll seem the same. but you'll hear the hissing noise. eventually you might get a code saying you're running lean.

it happened to me when i didnt rtv correctly with the pi intake install.