Are y'all sure it is a vacuum leak?
Your mechanic should be able to tell you by checking your STFT and LTFT values with a scan tool.
If you suspect the intake gasket, you can apply a little bit of pressure in the manifold and spray the gasket with soapy water.
Check the throttle body gasket and vacuum hoses for leaks as well.
Have you checked your egr valve and pcv valve/hose? If one of this valve is defective, it will have the same effect as a vacuum leak.
Also, a rough idle can be caused by a dirty/bad IAC, TPS sensor, MAF sensor, etc
Do you have any trouble code?
Wednesday, November 26th, 2008 AT 2:41 PM