The transmission in 1994 E150 van is very slow in changing gears in hot weather (takes 2 or 3 blocks or more). It works fine when the temperature is below 70F or 21C. Easing up on the gas pedal or manually shifting down and then up sometimes helps. If the temperature is in the 90F this trouble is on from a cold start. Often if the temperature is between 80F and 90F it works OK from a cold start but then if I stop such at a red light the trouble is on again. It is embarrassing going 10-20 mph with the engine roaring and traffic is building up behind me. My dealer says he cannot locate the problem unless it is on but as the temperature here is cooler than in the southern states where I go for winter holidays it is working most of the time here in northern Alberta. This trouble has been on for a few years but I would like to get it fixed as I would like to make more trips where it is warmer.