I used fog oil through the carbs while the boat was idling high and I noticed when I sprayed this fog oil through the #1 carb there was no profuse amount of smoke coming from the exhaust. The engine did bogg down for 15 seconds. Then I tried the #2 and #3 carbs (sprayed as directed) for 15 seconds through each carb and they both smoked A LOT. I do have spark on all [3]. What is the problem?