Unfortunately you can’t just set the idle. You are going to need to tune your Spica fuel pump. I think that somewhere on this board there is a set of instructions to do this. I don’t want to sound like a commercial for Wes Ingram but he is the go to guy for all things Spica. Wes has a book that is available on his website. Follow the steps outlined of any of the methods in order. It will take you a while the first time and you will have questions so don’t be hesitant to ask them here. We’re here to help and our experience, opinions, and advice are free.