switch up the ecu again with the p05, and see if it idles...if it does then try cleaning the iac. check to see if u got enough coolant. usually engine idles because not enough engine coolant. once u start up your car, coolant runs through the iac to keep a steady idle until the engine is fully warm dup. and get a carb cleaner and spray on all areas on the intak manifold, if u hear your engine at a peak where it was gonna die out then you might need to see if u got any air leaks, usually is the intake manifold gasket that goes bad....thats just some suggestion. something i ran through with my gsr swap.....one thing about no engine light with the p05 ecu is because it doesnt have no vtec, or vtec oil pressure switch and so on that a sohc vtec engine doesnt have, check to see if all wires that are nessesary for the vtec motor are connected.
this might help out too
http://www.honda-tech.com/zerothread?id=1564019
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