Have a look at this:
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not designing the device my self, not when there are prefectly good group projects which I could never get one as good as anyway. There is a HUGE amount of info on this. Its very detailed. People have put them on everything from small motorbikes (even some lawnmowers i think!!) to drag cars. They are working on a new EFI controller now, which will be nearer compleation early next year, thats what im waiting for as it will also map ignition from the same unit, which is something that will be very useful for me :)There is a very active Yahoo group
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and also one for an ignition controller
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There is also
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which I have not followed so closely as it relates mostly to GM Ecu's. Definately get the Haynes manual. Its very helpful :) ECUs are definately not the black art they are made out to be :)
I hope this helps,
Ed