My old dependable Ficht is giviing me a new problem. When it is cold, it starts like a new engine but after running 10-15 minutes on the lake, fishing for an hour or so, it is hard to start. It kicks back like a bad Bendix but I put a new one in a few months ago. I can push the neutral button and advance the throttle and she fires right up, smokes a lot but starts. When I put her on plane she acts like she is flooded till she gets a little speed then runs good at 4000 rpms where I usually run her. A while back I cleaned out the pressure sensor in the lower unit because she was idling bad and it did the job. Now after running the 10-15 minutes coming in she doesn't idle very good again. I checked the sensor and it was clear. Wonder if the tube going up to the computer is dirty? Thanks for any help y'all can give. She has over 710 hours but sure has been a good engine. Forgot to add I just put in new spark plugs, indexed them all.