It's definitely not the fuel or the fuel line. The vent is fine also. I'm not an engine man by any means. How do I check the spark? Explain about the coil or power pack if you would please.

Sounds to me like you are intermittently running on one cylinder you can tell which one by looking at the plugs right after it has the problem. The oily wet plug will be the one thats not fireing. If it is not a fouled plug that is cuasing this I would check the plug wire itself it could be chaffed or shorting out somewhere or possiblly the coil for that cylinder. the electronic ignition power packs for those engine uasuly do not intermitenly fail the ethier work and the engine runs or they don't. As far as other fuel problems i think Trobbin Rods cover them all with the possible exception of a pin hole in the fuel pump diafram but i think that would give you a flat fuel line priming ball too. You might consider buying a Clymer manual for you model and year motor also that will explain alot of stuff and if you are planning on keeping that motor it's a good investment. I have one for all my motors.
also
iboats.com repair forums on teh net is a very good source for reapir infro

Good luck

Glen

That's what I was told. So I changed the plugs and nothing has changed. Could I have blown a new plug right after I put it in? If so, what should I do?

Joe: To check spark,get a tester at a auto parts store,Napa, Robbins etc.Only a couple bucks.Take plug wire off a plug and insert one end of tester into it.Put other end of tester onto spark plug.Tester has a clear part that will flash every time spark goes from coil to plug.Motor will run with tester,just be sure it,s either in the water or on a hose.If all plugs are getting good spark,take plugs out and check for worn electrodes or fouling.I,m not a mechanic either,but hope this helps ya. Cal P.

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Replying to:

It's definitely not the fuel or the fuel line. The vent is fine also. I'm not an engine man by any means. How do I check the spark? Explain about the coil or power pack if you would please.

The plug problem is with the wires. When you throtle up the current goes out to ground. Slower speeds are less current and it runs fine. Put it on a hose and run it after dark in your back yard. You'll see blue sparks on the wire, change that one.