1995 Mariner 150 magnum

by Bob
(Ft Myers ,Fl)

Just installed a new control box(before this engine ran fine. After getting new box and cables installed I took it to the water. Engine fired right u,checked kill switch(fine) Idled out of no wake zone dropped the throttle and plop 2000 rpm is as far as she would go. Throttled up in neutral just fine but not in gear. I checked the spark and only firing on one bank. Any ideas?

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