Although there is differences between ms and extra it shouldn't be hard to get it idle. When you talk about bypass I will assume you are using a hei 7 or 8 module. With the bypass disconected set your initial to 10 advance. If everything else is correct it should run and idle. Once that is working you can proceed with setting the reference angle and that is done differently for different firmware but in extra go to fixed timing and do reference until it matches. This is from memory. I have two cars running ms and the setting can be different. I mostly fool with gm 6395 and 7427 although one of my cars has both gm and ms.