I was at a Ford dealer in NJ and brought my vehicle in for the idle and 1100 /1600 rpm shake. I met with 3 mechanics and the manager who stated that it is due to being tuned lean. I showed them the shake points and how it was a bother but then they asked me to put it in drive and rev it up to 3k and then don to 2k and the points I showed them. Not one bit of shake!!!!! They stated that when it is programmed it is set for idle lean