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Rough Idle after replacing valve cover gaskets and stems covers

13K views 10 replies 6 participants last post by  Bowdypat  
well, definitely double check the IACV hose. if it's loose or disturbed/leaking you will have idle problems.
 
maybe there's a pending code?

or try to get fuel trim and other data out of it.

Definitely go over every inch of the engine bay where you were working. maybe a displaced connector or vacuum line.