I have a 1986 Mariner 150 2 stroke that is acting up. It always starts quick and idles fine but at times it will bog down under acceleration, some times it will accelerate just fine. It has a new fuel pump, carbs just cleaned, tank just cleaned and new fuel filter. Last night I was going across the lake and it was bogging down and without me doing anything (as in moving throttle) the RPM's kicked up instantly it started running at normal RPM's and ran perfect. I have checked and made sure all electrical connections are clean and tight and battery is at full charge. It does not do this every time I take off, just intermittently. Any advice would be appreciated.