took to the lake today and a couple of times I was running and my 2001 F115 stalled. The final time it seemed worse than the others. i idled out of a cove got on a plane then the motor stalled out. I cranked it and idled for a minute gave throttle then it died again. Cranked it again, idled and gradually gave throttle and it ran like a champ. Any thoughts on what the issue is, if any? New gas 2 weeks ago, marine stabil with fill up, new oil in March, new impeller in march.