Oscillating idle

[john cris]

Hey
03 stock xlt
Recently begun oscillating idle more noticeable when cold. IAC and vacuum leaks?
Other ideas?

 

[Jbwaldrop88]

Oscillating as in rough, or? Mine has a rough idle and Im pretty sure its a leaking intake manifold gasket.

 

[john cris]

Yeah
Not sure where or why mine is doing it. A vacuum leak does seem likely as the oscillation has gone away lately. I bought some gaskets for the intake a while ago but haven’t installed them. I’m real leary about cracks in that plastic manifold