I have had a 72 300sd and an 82 300d and now an 83 300sd and all of them were extremely slow to take off but once i hit about 20(MPH) I gain speed a little quicker. I have looked at my fuel filters and they are clean but I have been told there is an adjustment that will aid in the speed issue, I am totally unsure what this adjustment looks like or where it is but it sounds alot like what someone referred to as a altitude adjustment earlier. Can someone give me a little more info on this adjustment? Thank you!