I used pico diagnostics to do relative compression on a 2000 Mits eclipse 3.0. It had been in a flood. Pulled plugs, turned motor by hand, (it had sat for 2 months). Plugs back in, and started car. Let it run for 5 mins or more, running rough. Then did pico compression test, key off, with start switch in place of start relay. I got different results every time. I haven't used this test much yet, although I plan too. Why the different test results?