Sounds like classic early carb issues. Most early OMC's require rejetting to run on the gas we have today. I had to do a rather large jet change to my 86 140 to get it to run correctly in the mid range without it falling on it's face. Unfortunately this is a known issue with the early small bore(85-87) loopers.
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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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