I have had it on for about 4 months now and I think I have developed a vacum leak. I had one after I installed it the first time and I fixed it it. It was leaking around the intake manifold gasket. I am going to check there this time too but is there anywhere else it might leak? I tightened it down excatly like the instructions said. Is there anyway to fix this problem for good? It is me and my wifes only car so we drove it daily for the past 4 months, why has this popped up now? Shouldn't it have happened earlier? Please help!