Could And Exhuast Leak Cuase This To Happen?

[93RiceKillinGT]

Could An Exhuast Leak Cause This To Happen????

For Starters I Have A Noticeable Exhuast Leak Where The Header Meets My X-pipe. Now When I Fire The Engine Up At First It Holds Idle Real Well For A Lumpy Idle Cam At Around 800-900 Rpm. Whem I Go To Rev Up The Engine To Lets Say 2000-3000 Rpm And Let Off The Car Comes Back To Idle And It Either Almost Dies Or Hessitates To Keep Idle Normal, It Would Surge From 200-1500 And Then Die. I Replaced My Iac, Have Good Oxygen Sensors, Egr Was In Good Working Order On My Other Engine, And Im Pretty Sure There Are No Vacume Leaks. So Can This Massive Exhuhuast Leak Cuase This Problem???

 

[ss93cobra]

Any idea what sort of vacuum you're running?

 

[93RiceKillinGT]

My Vacume Guage I Have Hooked Up To Vacume Tree On The Fire Wall Reads 10-15 Hgi Of Vacume Which I Think Is Good For A High Lift Low Duration Cam With A Lumpy Idle.

 

[ss93cobra]

Sounds about right. I realize an engine needs a certain amount of backpressure, but really, you can run a car open headers and not have any issues. Have you got access to a tester?

 

[2000xp8]

Fix the exhaust leak.
IMO that is the problem, but whats the difference it needs to be fixed anyway. I know how annoying that sound is.