I have had this issue for about a year now, if I need to get on it from a complete stop (say I was to floor it) there is no wheel spin and its really doggy until about 30 mph and then comes out of it. please note I don't drive the van like this very much but it wasn't like that the past 3 years. I don't beat on the van by any means. I bought the van from the original owner at 30,000 miles and there is 85,000 on it now. I have changed the spark plugs and have done a few transmission filter and fluid changes. I have a feeling its the transmission but I have also been told that it may be the controller for the transmission since they are known to have issues since they are right up front, it gets all the heat from the transmission and all the dirt and crap from the road. please understand I am not out there burning the tires off the thing or racing it. its just a big difference that I have noticed in the past year that the low end torque has really dropped off the earth