I have a 84 300d. I just put a used engine in it. When I got the car the engine was already out. Everything seems to work OK, but there is no low end power, and it idles rough. I adjusted the valves, Checked the timing - it was perfect. Checked for fuel leaks, replaced all the hoses and filters. Trans is starting in low gear and works fine. At take off it has nothing, you have to floor it to get rolling. At 10-25mph there is no real change in acceleration from 1/4 of a pedal to the floor. After 25mph it's fine, lots of power. Have I over looked something or should I just pull the pump and have it gone over?