lino,
That's the stuff the dealership gave me to try last year when I was going on a trip. I ran two cans back to back and it seemed to help a little, but once I got in stop and go traffic, the problem would reoccurr. I not beating on the dealership or the shop that worked on the car, I was trying to give some history on what I had already tried. I still use the same people to service the car when needed.

Is there a way to remove the fuel injector and test it, or is it hit and miss by just changing them. Thanks for the responses.

Robert