How to find a manifold leak.
1) get a spray bottle (like hairdresssers use)
2) set nosel to burst mode (like a single line of water type thing, not "spray"
3) Fill to top with water
4) turn car on, get somoene to hold at.. 2000 ? - just a few revs.
5) start at front of motor, and individually soak around each manifold port with water gun (as best as possible, given the K manifolds designs)
6) when motr starts to coff and splutter like a dog, try and concentrait on that area. Pin point where it is.
7)you've either found the leak, or u havnt ;)
:)