Thanks John,

I bought the spark testing tool today and did the test out of my
mercruiser book.
according to the test it's the ignition sensor/pick up below the rotor
in the distributor so i am going to try that. If that doesn't work i
will try the coil. After that it's off to pro help.

I definately see the spark using the tool comming out of the coil and i
think it's weaker at the plugs. hoping the senso will do it...

Thanks again for responding.