I have had some issues with my 3.0 Mercruiser starting after driving it for a while. It will turn over fine, but will not start for about 5 minutes. I am new to boating so I am not sure if I am properly starting it right when warm. Should I leave the throttle in neutral or should I give it half or full throttle? I brought it to a marina and they ran it on the muffs and they said they could not get it to act up. They also said that the plugs wires and distributer cap needed to be replaced, so I did that. I am taking it back on the water this weekend to see if that helps. My main question once again is how would you suggest to start when warm? I had tried different things but none worked. I just want to make sure I am not adding human error into the equation this weekend while I am trying to see if it starts better now. Thanks.