my 1978 85horsepower johnson V4 seahorse lately has been idley rough and missing on 1 cylinder, also when i go to full throttle it has no speed and just goes trolling speed, and it spews exhaust out the water discharge holes and spews water out of the exhaust... i havent ever had problems like this before and i had a compression test and they said it was fine.. they also replaced my fuel lines but yea i bought it brand new and have had no problems since... any help greatly appreciated!!!