I have a 1989 Johnson 60 HP that suddenly would not start and little spark. I replaced the power pack and the stator which fixed the starting and no spark issue. In testing at home with the ear muffs everything appeared great, started right up. I put it in the water and when I started it I lot of smoke. Once I got going it seemed to be running good until I accelerated into higher rpm. Then the motor started shaking badly and making popping noises. Is it possible I wired something incorrectly or got the trigger or something else off when installing the stator?