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in my experience a vacuum leak makes it run lean, you'd see positive fuel trims ( in the +17-25 area)
my theory is that too rich and negative fuel trims are exhaust leaks, but i've yet to get to try it in practice, but its only a matter of time.
however if it only does it at cold startup, its meant to run super rich since the elise doesn't have SAI, after warm up it settles down to -4 to +4 its fine, if it doesn't and continues to oscillate much higher and the rpms are wobbly too, as well as it being large value trims, i'd be looking at leaks then. -9 to +4 isn't horrible and that might be related to the version of relash you have, or a small leak.
to make matters worse sometimes exhaust leaks clear themselves up when everything gets upto temperature and the leaks self seal, so it can appear to be ok, when its not.
look for soot and heat damage on the clamps, clam , check where the header connects, as well as all of the joints and the cat for leaks.
i doubt its injectors, you'd have misfires and bad running too.
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