Thanks for letting me join what hear is very awesome gourp of people!!! I have a sn95 got for graduating in 95 Was the 3.8 now it's carbureted 5.4 cam lifters electric fuel pump lots more! Any way I Do Need Help a friend has a 4.6 2000 gt put some bolt on upgrade on it pretty much Everything you can upgrade without getting in the internals. The car started on first try was running rich no surprise 42lbs injectors the custom ordered sct tuner was supposed to help! Anyway car ran few minutes then shut down on it's own! Now hit the key sounds and acts like there's to much compression for the starter to turn over the motor! I grew up from day working on mustang first car Ever drove was 68 stang I know most all the tricks with the theft systems it's not that! Everything is working! Starter fuel coils everything hit the it does act's like to much compression! I've tried turning the crank by hand once it gets to compression can Not turn by hand any more. I'm worried about Snapping the crank bolt!!! Any suggestions would be greatly appropriated by both me and the 2000 vert gt owner