Need advise on 500 efi's
 

This weekend my starboard engine would start and run ok at idle, then after a couple minutes would die and would not restart for about 15 minutes. I think it was loading up at idle, and then would only start after it dried out. I found that if I would start it and run the RPMs up to about 1500 for a few minutes then it would idle fine. Any advice on what could cause this ? Both engines smell like they are running rich. Is there anything that i could check.

May be a sticking fuel injector. I would pull plugs after idleing engine. What plug is black will be the one with leaking injector.