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He said he just changed the AOS,
I had a similar problem, sometimes (more often when cold) the car would almost choke.. then it was coming back
For me rough iddle was fixed by cleaning MAF/Throttle body and replacing spark plugs/fuel filter, not sure which one did it..
Another option is that while replacing AOS you/your friend didn't connect all the tubes tightly.. a vacuum leak can rough up your idle as well.
Thanks
Sasha
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