Are you sure on the year? Not many EFI engines in 90 from MERCURY except for the high end performance engines. Start with the basics, check compression, spark, timing, and if it's an EFI engine you should probably send the injectors out to BROCATO or somebody for cleaning and flow testing as well as adjust the TPS.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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