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Moosing is normally the IACV.

Not sure how an exhaust leak would cause that...do you have a known exhaust leak?
 

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Moosing is normally the IACV.

Not sure how an exhaust leak would cause that...do you have a known exhaust leak?
Yep. Have a broken rear manifold stud that's mostly fixed, but still a bit bodged. As you know the secondary O2 sensor is on the y-pipe. I know its not usual but ive seen an O2 getting bad info and effect idle on a few engines in my time. I had partial moosing months ago and google said it was the DPFS or EGR so I replaced both and it went away until now. The IAC is new from a previous owner and pretty clean so I was just wondering.
 
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