erratic spark loss

[Javelin 353]

1991 70 hp Johnson. Lately when useing boat I will lose spark to middle cylinder, some time while running other times after sitting, and on start up motor will only turn @3000. Replaced coils, powerpack, waterpump and impeller and have checked all terminals for loose wires, checked key switch for loose wires also all battery cables are clean and tight. I am out of IDEAS need help!<br />Thanks<br />Ps. makes no difference if temp sensor is plugged in or not and alarm does sound when Grounded.

 

[Javelin 353]

Re: erratic spark loss

BUMP>>>

 

[Javelin 353]

Re: erratic spark loss

Really need some ideas

 

[Javelin 353]

Re: erratic spark loss

okay I guess I'm on my own now,

 

[zaner]

Re: erratic spark loss

I don't know much about your motor but if it has a condesor I'd replace it