1998 Mercury 40/30 jet

by Myles
(Bainbridge PA)

Since late last fall my motor has been giving me fits. After start up I let it idle for a short time. I then engage the throttle and power up. When I hit top speed after about 20-30 seconds the engine power throtles down. The throtle is in high but the motor and power falls to at least half power. The motor continues to run smoothly but just at reduced speed.I had it in the shop in March describing this issue. The shop rebuit the fuel pump, new spark plugs and new gas line. I also changed to a new tank. Water in fuel is not an issue as I have new tank, new lines, new filter and lines.What can I do now? Thank you.

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