ok i had a prob with my rpms dropping real fast when slapping the gas buts gone away for the most part.. and now i have some what of a scratching sound.. its hard to explain.. it could sounds like a dog growling if u will..anywho somedays its loud and some its quiet but occasionally i get a hesitation at high rpms... im kinda thinking vacuum leak but not sure.. any sugjestions on where to look???

 

Is power way down?
Check engine light?
Is the car stock, or modified?

I'm not sure, but you may be hitting the over boost fuel cut.

 

no its not cut out.. ther is no power loss or if ther is i cant tell.. no check engine lights or anything..

 

pull the dog out of your exaust lol.....

 

When you're cruising with the throttle very near idle, you can sometimes hear the rear rotor fuel cut. It's like a soft growl.
When you're decelerating with a closed throttle, you get fuel cut on both rotors (you're just pumping air). If while slowing down, you pick up just a little throttle, you can hear the front rotor get fuel before the rear.
Same sound?

 

not really.. it kinda sounds like that but alot louder.. it sounds as tho a hose is loose or sumthing... its hard to explain... it only makes the noise when not accelerating.. so even at high rpms while decelerating it will make the noise or with the clutch in..anytime im not accelerating

 

Is the ACV outlet pipe & muffler hooked up?
Maybe air pump noise?

 

i cant really tell for sure.. but tommorow imma try and make a full inspection and if no avail i shall come back and post again