I have a 97 Ranger 354 with a Johnson 150 Fast Strike engine. My problem is: I start out and the motor starts and idles fine and I will make a 10 minute run to another area. I will stay there for 15-30 minutes and I start up to leave. When I put down the accellarator the engine acts like it is "loading up" and chocking down. It takes several tries before it catches and goes on. I had an on-lake machenic check it out a couple of months ago and he could not make it do it. He just replaced the plugs and charged me an exhorbatant amount. I have replaced the pump ball and next week, I intend to spray "Gumout" into the carbs, run some Seafoam trough it and change to gas filter. Am I doing the right things and where is the filter on this engine?