It sounds like throttle cable slack, or binding of the cables in the cable casings. I'd lube cables first. When you've got the throttle/shifter/VTS control out on the side of the boat, try operating the throttle and watch the cables - they should not bind, they should slide smoothly. Good luck.
Update: I found the problem: The bilge pump hose does not reach the bottom of the bilge. However, I was able to acces the bilge throught a small space between a metal plate and the bottom of the hull just forward of the engines. I used a turkey baister with 2 feet of hose attached. I managed to suck up about 1/2 a gallon of chocolate milk colored (oil/water) solution. It took about 30 minutes of contorted postures in the engine compartment. A longer hose on the bilge pump is the solution. Thanks for the info and ideas.
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