94 75 hp has a hesitant take off like it is bogging down then it irratically starts taking off. have checked the cyl pressure and each are around 160 psi, swapped plugs & no change, on the water hose in driveway it is only firing on the front cylinder. pulled the plugs and laid them on the cylinder head while connected and turned the engine over and could see a spark from each. a guy told me that you really cant test them that way and i probably have a bad coil pack? is there a way to test this? or this even the problem >

 

Sounds like carburation to me.....