I have a 3011 Honda lawn mower that will start, but will only stay running if you hold key in the starting position, when you release the key it quites, Ive already replaced the CDI and the key switch, any help would help, Thanks

Hi,
It has a pricey control module usually to the right and forward of the engine. The following link is the best I have seen to look up parts and they have as good or better prices of anyone I know. See:
Boats.net - New and Used Boats for Sale, Outboard Boat Motors, and Discount Outboard Boat Parts
Peace,
Clarke