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I have a 2006 XB can't keep the thing running idles ruff and misses while while driving was told by one scion dealer it was bad gas, paid that bill now after 3 gas tanks of new fuel I took it to another scion dealer now I am being told it is a ecu has any one else experience this the xb has 78000 miles on it and I boughtit new and this is the only problem I have had with it.
Could be in need of a tune-up, perhaps cleaning of the MAF sensor, or like Zach said, the intake could be dirty or the filter could be causing it...
I would suggest posting this thread in the xB forum, if you get no answers there, perhaps check out the Scikotics website, there are a good deal of xB owners that may have the information you need to get yourself squared away.