Riley

Hey guys,  Just purchased a car which has an old link G1 I believe in it. This is my first time tuning on a link unit before, I like it! However I am getting an extremely high idle. Whenever I start the car (subaru with a bored and built 2.6l) it instantly revs out to 3k+ and sits there. If I lower the timing and fuel in those cells it is at my idle drops down, but i cant get it to go below 1500 without the car running really rough. I guess I might need help setting up my Fuel Master trim?  I am on Wrx 420cc injectors. Is it just that simple that I set the Fuel Master to 42? Or what is this number pertain to. I am used to tuning on romraider and ecuflash.