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Discussion Starter #1
i have an '05 titan 4x2. i noticed when i push the throttle their is a air sucking sound(less than a second) before the rpm's increase. i assume that i have a vacuum leak but i can't seem to find it. it sounds like it is coming from the back of the engine or behind or by the firewall. i have not noticed any rough idle or decrease in performance.
is this normal or does anyone have any ideas.
 

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With a CAI, it's even more noticeable and perfectly normal.
 

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does it sound like this?

:feuerkopf2-big:
 

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