Have you wired the management light in?


TBH it sounds like some sort of air leak possibly after the flow meter making it go very lean, do you have a wideband you could confirm that with?

Different revisions of the ECU have different TPS units, some are (like you have been told) basically just a switch, others are more like the cossie type in terms of being variable resistance.

If all else fails, then as a temporary measure just adjust the throttle cable so it holds the butterfly open, that should keep it running long enough for you to take it somewhere with the correct equipment to look at it.