Johnson Oceanrunner rpms surge

[richard oprey]

"Please help!!I cant figure ou

"Please help!!I cant figure out whats wrong with my 1997 Johnson 175 oceanrunner.One cylinder is not firing--clean as a whister I checked,I checked the ignition pack--this seems to be ok.boat surges when throttle powered up--rpms go up and down.What can be causing this problem?what can cause my one spark plug to not fire?
thanx
rich"

 

[pops86]

"I would check the compression

"I would check the compression on the misfiring cylinder, and all the rest.
If o.k. I would check and clean the coil connections, spark plug wire, and hot wire.
Is the fuel filter(s) clean??
Is the fuel line leak free--and all connections tight? Hope this helps."