My 85 300td has a problem when it is at operating temperature and the rpm's are below 1500. The problem is that it has next to no power and no response to flooring the accelerator. I am in the process of obtaining a compression tester to verify compression and I also want to test the injection pump. How does one test the fuel pressure, and does anyone have any other suggestions as to what the problem may be? The performance is great when she is cold and great above 1500 rpms. Thank you.