ok well from what ive gathered. he has a GenV LIM and a Gen3 blower. there is your first problem and the massive vac leak because the LIM is 1/2 inch longer opening for the blower. now onto problem 2 you need a regular throttle body that is not DBW. why are you running an LQ4 maf for? use your throttle body from the old engine. as blue stated you also need a tune for the LQ4 maf. let us know what is going on