I have a 4port hyper21 engine on my K2 . I am new to this so forgive me . I was readingthe ofna site about tuning and it said DON"T ADJUST THE MSN ( midrange needle screw ) . I turned it about a 1/4 turn and then back again . Is that really bad ? What if it is not in the exact same spot ? It may be off by like a 1/16th of a inch. What shouldi do ? The car seems to run fine . Starts really fast , I am just in the middle of tuning the hsn and lsn to get best temps and acceleration .