Air leaking between throttle body and intake coupler

[07s197gt]

Hey everyone. I was wondering if someone could help me out. Yesterday I installed a JTL intake and tune. Car runs great after the install however I have a leak between the intake coupler and throttle body. I can feel the air if I put my hand by the throttle body. I also feel a slight misfire during idle which is what made me check the intake for a leak. I tightened the bolts on the clamp and held the tube in place firmly against the throttle body while tightening the bolts. There is less air blowing out now but I can still feel some and I still feel a misfire. Can someone please give me some advice or a trick to properly install the intake? Should I have placed the coupler on the throttle body first then put the intake tube through it instead of the coupler on the tube first then having placed it on the throttle body? Could I have overtightened the bolts on the clamps? Any help is greatly appreciated!