Since new, my van has sporadically had a few-second lag between reverse and drive when cold, but of course was told that this was 'normal operating procedure'. At 59K miles, I had the trans serviced only as a maintenance item. The dealer flushes, not only drains and refills, the fluid. Within a couple months, I had to add about half a pint of ATF, and noticed that every once in a while, pulling away from a stop, I got a sensation like someone had bumped me from behind. Also, lately, if the van has been driven on the highway for a number of miles, then you get off and drive in stop-and-go traffic, upshifts all of a sudden become hard. If you then stop for gas, or whatever, turning the car off, then back on, the shifting is as smooth as butter, just like when you start in the morning. This indicates to me it's something electronic, but I'm not getting a Service Engine Soon light on. Anybody else having this?