anyone recomend descent leakdown tester?

i do have a broken intake manifold stud on the passenger side in the middle.... I need to get it drilled out, but i hate drilling broken studs out and the last three that were broken was a huge pita to drill out, but i figured since it was broken in the middle i would get by just filling the hole with silicone untill i got a free afternoon and the motivation to get it out. Could that be causing my smoking upon de-acceleration? Maybe i should take the intake off and drill that broken stud out and throw a brand new gasket on it and get new intake manifold bolts and tighten it down good and tight and see if that siolves it, its worth trying before buying new heads.....