Well today I took my daughter to work in the 4.6iS and as driving away I thought to myself WOW this 4.6 has been pretty reliable since I purchased it and did a bunch of work to it. I proceeded to go wash it up and vacuum it to enjoy it as I have always. On the way home post wash, I got to a red light and when it turned green I gave a little gas and no movement. The RPMs started to rise snd then BAM it kicked into gear and trans failsafe popped up. The X drives fine in reverse but is shaky in D and wont really move. I limped it into the garage as I consider my options. Any ideas? Can it be the torque converter or something internal to the trans has let go? Only error in the EGS is stall speed which points to some sort of mechsnical failure. When it rains it pours!
