Odb2 not working. Along with fuel pump?

[Khiggins]

Im having an issue... i just had to rewire the "perf shift" due to it being ripped out hy previous owner was on my way home with it last night and hit the button. Well it worked but it killed the car. Now it wont read codes "link error" and it worked yesterday mayne 20 minutes before the problems started. I got it towed home and it no longer fires and i have no power to fuel pump or its shorted itvout somewhere ive been trying to figure this out all day and have gotten no where..