Yep, it's an 87, and it has the 85-87 ignition(85 was the first year of the looper for the V-4 and V-8). The wire your talking about is a bonding wire. As for the idling, make sure the t-stats are in and working, make sure the bypas valve for the t-stats is operating and set in place correctly, make sure you have QL77JC4 plugs(QL78YC's will not idle worth a crap in these engines), and also make sure the correct carbs are on it and not warped.
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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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