Hi Josh well done on the install sorry to hear its biting you in the ar$e............. couple of things spring to mind......as already said possible inlet gasket not sealing near no.8 cylinder, you could try spraying aerosol brake cleaner or easy start around the area and see if the revs pick up......I know this sounds stupid and you've probably checked it but a loose spark plug would give a ticking/clacking sound!!..... swapping the injector to an adjacent cylinder would rule that out if its still lumpy on the same cylinder.........you'll sort it.......... remember if this sort of thing were easy everyone would be doing it ! keep us posted Simon