I have a 2000 Mercury 115hp outboard motor that I haven't used in about a year and a half. I recently took it out to the lake and it cranked up with no problem. It will idle fine but when I put it in drive it will not go any faster than about 15 mph and thats with the throttle wide open. I put it in reverse and it seems to run fine even at full throttle. I did replace the spark plugs and I noticed that after a while of just trying to get the motor to open up I decided to take out the spark plugs and check them. 1 and 2 plugs were black and a little wet and the 3 and 4 plugs you could tell they were firing but they weren't black or wet. So, I think that maybe 1 & 2 aren't getting any spark and I need to replace the coil for 1 and the coil for 2. Please help me cuz I don't want to get torched by the dealer. 