1984 300D acceleration problem
 

My 300D has a problem accelerating uphill and from a standing start. What are the first and easiest things to check? Some times I cant get it over 20 mph. Its got 250000 miles on it its rusty and I just use it to get to work. In other words if its not something simple Ill junk it or keep it for parts and get another one. Thanks in advance for any help.

Check the banjo fitting and boost sensor line. Do a search and you will find instructions on how to clean them out.
Change the fuel filters.