1977 35 johnson runs rough ans misses on one cylinder when you acelerate through mid throttle.New plugs good compression and power pack is ok also cleaned carberator.Could problem be a bad coil?
Checked the spark on both cylinders,the top cyl fires accross a 1/2 in gap but the bottom cyl.you have to close the gap to 3/8 of a inch before you get spark could this be a weak coil or a bad wire?
